Title of Invention: Anti-VEGF antibodies Abstract: The vascular endothelial growth factor (VEGF) activity in a patient's bloodstream or other biological sample can serve as a diagnostic and prognostic index for cancer, diabetes, heart conditions, and other pathologies. Antibody-sandwich ELISA methods and kits for VEGF as an antigen are provided to detect types of VEGF levels in biological samples from animal models and human patients and can be used as a diagnostic/prognostic index. Detailed Description: Part general_description_paragraphs: Part RELATED APPLICATION: This application is a continuation of U.S. Ser. No. 11/866,560, filed on Oct. 3, 2007, now abandoned, which claims priority to and the benefit of U.S. Provisional Application No. 60/828,203, filed Oct. 4, 2006, the specification of which is incorporated herein in its entirety. Part FIELD OF THE INVENTION: This invention relates to immunoassays for detecting certain populations of VEGF that can be used as diagnostic and prognostic methods for patients with cancer, cardiovascular, or other pathologies. Part BACKGROUND: It is now well established that angiogenesis is implicated in the pathogenesis of a variety of disorders. These include solid tumors, intra-ocular neovascular syndromes such as proliferative retinopathies or age-related macular degeneration (AMD), rheumatoid arthritis, and psoriasis (Folkman et al. J. Biol. Chem. 267:10931-10934 (1992); Klagsbrun et al. Annu. Rev. Physiol. 53:217-239 (1991); and Garner A, Vascular diseases. In: Pathobiology of ocular disease. A dynamic approach. Garner A, Klintworth G K, Eds. 2nd Edition (Marcel Dekker, NY, 1994), pp 1625-1710). In the case of solid tumors, the neovascularization allows the tumor cells to acquire a growth advantage and proliferative autonomy compared to the normal cells. Accordingly, a correlation has been observed between density of microvessels in tumor sections and patient survival in breast cancer as well as in several other tumors (Weidner et al. N Engl J Med 324:1-6 (1991); Horak et al. Lancet 340:1120-1124 (1992); and Macchiarini et al. Lancet 340:145-146 (1992)). The search for positive regulators of angiogenesis has yielded many candidates, including, e.g., aFGF, bFGF, TGF-α, TGF-β, HGF, TNF-α, angiogenin, IL-8, etc. (Folkman et al., supra, and Klagsbrun et al., supra). Some of the negative regulators so far identified include thrombospondin (Good et al. Proc. Natl. Acad. Sci. USA. 87:6624-6628 (1990)), the 16-kilodalton N-terminal fragment of prolactin (Clapp et al. Endocrinology, 133:1292-1299 (1993)), angiostatin (O'Reilly et al. Cell 79:315-328 (1994)), and endostatin (O'Reilly et al. Cell 88:277-285 (1996)). Work done over the last several years has established the key role of vascular endothelial growth factor (VEGF) in the regulation of normal and abnormal angiogenesis (Ferrara et al. Endocr. Rev. 18:4-25 (1997)). The finding that the loss of even a single VEGF allele results in embryonic lethality points to an irreplaceable role played by this factor in the development and differentiation of the vascular system (Ferrara et al., supra). Furthermore, VEGF has been shown to be a key mediator of neovascularization associated with tumors and intra-ocular disorders (Ferrara et al., supra). The VEGF mRNA is overexpressed by the majority of human tumors examined (Berkman et al. J Clin Invest 91:153-159 (1993); Brown et al. Human Pathol. 26:86-91 (1995); Brown et al. Cancer Res. 53:4727-4735 (1993); Mattern et al. Brit. J. Cancer. 73:931-934 (1996); and Dvorak et al. Am J. Pathol. 146:1029-1039 (1995)). Also, the concentration of VEGF in eye fluids is highly correlated to the presence of active proliferation of blood vessels in patients with diabetic and other ischemia-related retinopathies (Aiello et al. N. Engl. J. Med. 331:1480-1487 (1994)). Furthermore, studies have demonstrated the localization of VEGF in choroidal neovascular membranes in patients affected by acute macular degeneration (AMD) (Lopez et al. Invest. Ophtalmo. Vis. Sci. 37:855-868 (1996)). VEGF is produced by tissues and does not have to enter the circulation to exert its biological effect, but rather acts locally as a paracrine regulator. A recent study by Yang et al. J. Pharm. Exp. Ther. 284:103 (1998) found the clearance of rhVEGF165 from the circulation to be very rapid, suggesting endogenous VEGF in the circulation is most likely the result of continual synthesis of VEGF. In addition, several studies have tried to correlate levels of circulating VEGF with tumor burden and have suggested VEGF levels as a potential prognostic marker (Ferrari and Scagliotti Eur. J. Cancer 32A:2368 (1996); Gasparini et al. J. Natl. Cancer Inst. 89:139 (1997); Kohn Cancer 80:2219 (1997); Baccala et al. Urology 51:327 (1998); Fujisaki et al. Am. J. Gastroenterol. 93:249 (1998)). Clearly the ability to accurately measure VEGF will be important to understand its potential role(s) in many biological processes, such as maintenance of vascular patency, menstrual cycle, ischemia, diabetes, cancer, intraocular disorders, etc. The literature reports widely varying concentrations of endogenous VEGF in normal and diseased patients, ranging from undetectable to high levels. The ability to measure endogenous VEGF levels depends on the availability of sensitive and specific assays. Colorimetric, chemiluminescence, and fluorometric based enzyme-linked immunosorbent assays (ELISAs) for VEGF have been reported. Houck et al., supra, (1992); Yeo et al. Clin. Chem. 38:71 (1992); Kondo et al. Biochim. Biophys. Acta 1221:211 (1994); Baker et al. Obstet. Gynecol. 86:815 (1995); Hanatani et al. Biosci. Biotechnol. Biochem. 59:1958 (1995); Leith and Michelson Cell Prolif. 28:415 (1995); Shifren et al. J. Clin. Endocrinol. Metab. 81:3112 (1996); Takano et al. Cancer Res. 56:2185 (1996); Toi et al. Cancer 77:1101 (1996); Brekken et al. Cancer Res. 58:1952 (1998); Obermair et al. Br. J. Cancer 77:1870-1874 (1998); Webb et al. Clin. Sci. 94:395-404 (1998). For example, Houck et al., supra (1992) describe a colorimetric ELISA that appears to have ng/ml sensitivity, which may not be sensitive enough to detect endogenous VEGF levels. Yeo et al., supra (1992) describe a two-site time-resolved immunofluorometric assay, however, no VEGF was detected in normal sera (Yeo et al. Cancer Res. 53:2912 (1993)). Baker et al., supra (1995), using a modified version of this immunofluorometric assay, reported detectable levels of VEGF in plasma from pregnant women, with higher levels observed in women with preeclampsia. Similar data in pregnant women were reported by Anthony et al. Ann. Clin. Biochem. 34:276 (1997) using a radioimmunoassay. Hanatani et al., supra (1995) developed a chemiluminescent ELISA capable of measuring circulating VEGF and report VEGF levels in sera from 30 normal individuals (male and female) from 8-36 pg/ml. Brekken et al, supra (1998) described ELISA assays using antibodies having binding preference to either the VEGF alone or the VEGF:Flk-1 complex. An ELISA kit for VEGF detection is commercially available from R&D Systems (Minneapolis, Minn.). The R&D VEGF ELISA kit has been used in sandwich assays wherein a monoclonal antibody is used to capture the target VEGF antigen and a polyclonal antibody is used to detect the VEGF. Webb et al. supra (1998). See, also, e.g., Obermair et al., supra (1998). Keyt et al. J. Biol. Chem. 271:7788-7795 (1996); Keyt et al. J. Biol. Chem. 271:5638 (1996); and Shifren et al., supra (1996) also developed a colorimetric ELISA based on a dual monoclonal antibody pair. Although this ELISA was able to detect elevated VEGF levels in cancer patients, it lacked the sensitivity needed to measure endogenous levels of VEGF in normal individuals. Rodriguez et al. J. Immunol. Methods 219:45 (1998) described a two-site fluorimetric VEGF ELISA that yields a sensitivity of 10 pg/ml VEGF in neat plasma or serum. However, this fluorimetric assay detects fully intact 165/165 and 165/110 species of VEGF (It has been reported that VEGF 165/165 can be proteolytically cleaved into three other forms: a 165/110 heterodimer, a 110/110 homodimer, and a 55-amino-acid C-terminal fragment (Keyt et al. J. Biol. Chem. 271:7788-7795 (1996); Keck et al. Arch. Biochem. Biophys. 344:103-113 (1997)).). Thus, there is a need to develop a diagnostic and prognostic assay that detects higher measurable levels of VEGF in a biological sample of an animal model or patient than existing ELISAs, and/or can measure different isoforms of VEGF. Part SUMMARY: Antibody-sandwich ELISA methods for VEGF as an antigen were developed to detect VEGF forms in biological samples. The VEGF ELISA provided herein is capable of detecting VEGF isoforms and fragments of VEGF greater than 110 (“VEGF110+”). Kits thereof are also provided. For example, methods for detecting selective vascular endothelial growth factor (VEGF) forms greater than 110 amino acids (VEGF110+) in a biological sample comprise the steps of: (a) contacting and incubating the biological sample with a capture reagent immobilized to a solid support, wherein the capture reagent is an antibody that recognizes same epitope as antibody 5C3 against human VEGF, said monoclonal antibody binding specifically to residues greater than 110 of human VEGF; (b) separating the biological sample from the immobilized capture reagents; (c) contacting the immobilized capture reagent-target molecule complex with a detectable antibody that binds to the KDR and/or FLT1 receptor binding domains of VEGF; and (d) measuring the level of VEGF110+ bound to the capture reagents using a detection means for the detectable antibody. In certain embodiments, the detectable antibody binds to an epitope in VEGF 1-110. In certain embodiments, comparison ELISA can be performed to detect different types of VEGF. In certain embodiments, the biological sample (e.g., tumor samples or tumor lysates, plasma, serum, or urine, etc.) is isolated from a human subject. In one embodiment, the capture reagent is the 5C3 monoclonal antibody. In one embodiment, the immobilized capture reagent is coated on a microtiter plate. In certain embodiments, the detectable antibody is a monoclonal antibody. In one embodiment, the detectable antibody is a murine monoclonal antibody. In one embodiment, the immobilized monoclonal antibody is MAb 5C3 and the detectable antibody is MAb A4.6.1. In certain embodiments, the detectable antibody is directly detectable. In one embodiment, detectable antibody is amplified by a colorimetric reagent. In one embodiment, the detectable antibody is biotinylated and the detection means is avidin or streptavidin-peroxidase and 3,3′,5,5′-tetramethyl benzidine. In certain embodiments of the invention, the human subject is a vascular, diabetic, or cancer patient and the measuring step (d) further comprises a comparison with a standard curve to determine the level of VEGF compared to a normal individual. Kits are also provided. For example, an immunoassay kit for detecting vascular endothelial growth factor (VEGF) forms greater than 110 amino acids (VEGF110+) in a biological sample can comprise: (a) as capture reagent, an antibody against human VEGF, wherein the monoclonal antibody binds specifically to the residues greater than 110 of human VEGF; and (b) as detection reagent, a detectable antibody that binds to the KDR and/or FLT1 receptor binding domains of VEGF. In certain embodiments, the detectable antibody binds to an epitope in VEGF 1-110. In certain embodiments, the kit, further comprises a solid support for the capture reagents. For example, the capture reagents can be immobilized on the solid support (e.g., a microtiter plate). In certain embodiments, the kit further comprises a detection means (e.g., colormetric means, fluorimetric means, etc.) for the detectable antibodies. In certain embodiments, the kit further comprises purified VEGF as an antigen standard. In certain embodiments of the invention, an additional VEGF ELISA or more can be provided for comparison studies with the VEGF110+ ELISA. In one embodiment, the kit includes a capture reagent monoclonal antibody, which is murine monoclonal antibody MAb 5C3, and a detectable antibody, which is MAb A4.6.1. In yet another embodiment, the invention provides an anti-VEGF antibody 5C3 (obtainable from or produced by hybridoma deposited under ATCC number PTA-7737). The invention also provides an antibody that does not bind VEGF 1-110 and binds to the same VEGF110+ epitope as the monoclonal antibody produced by hybridoma cell line PTA-7737. In certain embodiments, an antibody of the invention is conjugated to a detectable label. In one embodiment, the hybridoma 5C3.1.1 deposited under ATCC deposit number PTA-7737 is provided. Part DETAILED DESCRIPTION: Definitions Before describing the present invention in detail, it is to be understood that this invention is not limited to particular compositions or biological systems, which can, of course, vary. It is also to be understood that the terminology used herein is for the purpose of describing particular embodiments only, and is not intended to be limiting. As used in this specification and the appended claims, the singular forms “a”, “an” and “the” include plural referents unless the content clearly dictates otherwise. Thus, for example, reference to “a molecule” optionally includes a combination of two or more such molecules, and the like. The term “VEGF” as used herein refers to the 165-amino acid vascular endothelial cell growth factor, and related 121-, 145-, 189-, and 206-amino acid vascular endothelial cell growth factors, as described by Leung et al. Science 246:1306 (1989), Houck et al. Mol. Endocrin. 5:1806 (1991), and Neufeld et al., supra, together with the naturally occurring allelic and processed forms of those growth factors. See also, e.g., FIGS. 1A and B of U.S. Pat. No. 6,057,428. Active VEGF fragment can be released from ECM-bound VEGF by plasmin cleavage, generating the first 110 amino acids (see, e.g., Keyt B A, et al.: The carboxyl-terminal domain (111-165) of vascular endothelial growth factor is critical for its mitogenic potency. J Biol. Chem. 271: 7788-7795 (1996)). “VEGF110+” as used herein refers to VEGF fragments that are greater than 110 amino acids (from the N-terminal), but do not include the first 110 amino acids or smaller fragments (e.g., VEGF8-109). The term “detecting” is used in the broadest sense to include both qualitative and quantitative measurements of a target molecule. In one aspect, the detecting method as described herein is used to identify the mere presence of VEGF110+ or VEGF in a biological sample. In another aspect, the method is used to test whether VEGF110+ or VEGF in a sample is at a detectable level. In yet another aspect, the method can be used to quantify the amount of VEGF110+ or VEGF in a sample and further to compare the VEGF110+ or VEGF levels from different samples. The term “biological sample” refers to a body sample from any animal, but preferably is from a mammal, more preferably from a human. In certain embodiments, such biological sample is from a vascular, diabetic, or cancer patient. Such samples include biological fluids such as serum, plasma, vitreous fluid, lymph fluid, synovial fluid, follicular fluid, seminal fluid, amniotic fluid, milk, whole blood, urine, cerebro-spinal fluid, saliva, sputum, tears, perspiration, mucus, tumor lysates, and tissue culture medium, as well as tissue extracts such as homogenized tissue, tumor tissue, and cellular extracts. In certain embodiments, the sample is a body sample from any animal, in one embodiment it is from a mammal, in one embodiment from a human subject. In one embodiment, such biological sample is from clinical patients. The term “detectable antibody” refers to an antibody that is capable of being detected either directly through a label amplified by a detection means, or indirectly through, e.g., another antibody that is labeled. For direct labeling, the antibody is typically conjugated to a moiety that is detectable by some means. In one embodiment, the detectable antibody is biotinylated antibody. The term “detection means” refers to a moiety or technique used to detect the presence of the detectable antibody in the ELISA herein and includes detection agents that amplify the immobilized label such as label captured onto a microtiter plate. In one embodiment, the detection means is a colorimetric detection agent such as avidin or streptavidin-HRP. The term “capture reagent” refers to a reagent capable of binding and capturing a target molecule in a sample such that under suitable condition, the capture reagent-target molecule complex can be separated from the rest of the sample. Typically, the capture reagent is immobilized or immobilizable. In a sandwich immunoassay, the capture reagent is preferably an antibody or a mixture of different antibodies against a target antigen. The term “antibody” herein is used in the broadest sense and specifically covers intact monoclonal antibodies, polyclonal antibodies, multispecific antibodies (e.g. bispecific antibodies) formed from at least two intact antibodies, and antibody fragments so long as they exhibit the desired biological activity. “Antibody fragments” comprise a portion of an intact antibody, preferably comprising the antigen-binding or variable region thereof. Examples of antibody fragments include Fab, Fab′, F(ab′)2, and Fv fragments; diabodies; linear antibodies; single-chain antibody molecules; and multispecific antibodies formed from antibody fragments. For the purposes herein, an “intact antibody” is one comprising heavy- and light-chain variable domains as well as an Fc region. “Native antibodies” are usually heterotetrameric glycoproteins of about 150,000 daltons, composed of two identical light (L) chains and two identical heavy (H) chains. Each light chain is linked to a heavy chain by one covalent disulfide bond, while the number of disulfide linkages varies among the heavy chains of different immunoglobulin isotypes. Each heavy and light chain also has regularly spaced intrachain disulfide bridges. Each heavy chain has at one end a variable domain (VH) followed by a number of constant domains. Each light chain has a variable domain at one end (VL) and a constant domain at its other end; the constant domain of the light chain is aligned with the first constant domain of the heavy chain, and the light-chain variable domain is aligned with the variable domain of the heavy chain. Particular amino acid residues are believed to form an interface between the light-chain and heavy-chain variable domains. The term “monoclonal antibody” as used herein refers to an antibody obtained from a population of substantially homogeneous antibodies, i.e., the individual antibodies comprising the population are identical except for possible naturally occurring mutations that may be present in minor amounts. Monoclonal antibodies are highly specific, being directed against a single antigenic site. Furthermore, in contrast to conventional (polyclonal) antibody preparations that typically include different antibodies directed against different determinants (epitopes), each monoclonal antibody is directed against a single determinant on the antigen. In addition to their specificity, the monoclonal antibodies are advantageous in that they are synthesized by the hybridoma culture, uncontaminated by other immunoglobulins. The modifier “monoclonal” indicates the character of the antibody as being obtained from a substantially homogeneous population of antibodies, and is not to be construed as requiring production of the antibody by any particular method. For example, the monoclonal antibodies to be used in accordance with the present invention may be made by the hybridoma method first described by Kohler et al., Nature, 256:495 (1975), or may be made by recombinant DNA methods (see, e.g., U.S. Pat. No. 4,816,567). The “monoclonal antibodies” may also be isolated from phage antibody libraries using the techniques described in Clackson et al. Nature 352:624-628 (1991) and Marks et al., J. Mol. Biol., 222:581-597 (1991), for example. The monoclonal antibodies herein specifically include “chimeric” antibodies (immunoglobulins) in which a portion of the heavy and/or light chain is identical with or homologous to corresponding sequences in antibodies derived from a particular species or belonging to a particular antibody class or subclass, while the remainder of the chain(s) is identical with or homologous to corresponding sequences in antibodies derived from another species or belonging to another antibody class or subclass, as well as fragments of such antibodies, so long as they exhibit the desired biological activity (U.S. Pat. No. 4,816,567; Morrison et al., Proc. Natl. Acad. Sci. USA, 81:6851-6855 (1984)). Chimeric antibodies of interest herein include “primatized” antibodies comprising variable-domain antigen-binding sequences derived from a non-human primate (e.g. Old World Monkey, such as baboon, rhesus or cynomolgus monkey) and human constant-region sequences (U.S. Pat. No. 5,693,780). “Humanized” forms of non-human (e.g., murine) antibodies are chimeric antibodies that contain minimal sequence derived from non-human immunoglobulin. For the most part, humanized antibodies are human immunoglobulins (recipient antibody) in which residues from a hypervariable region of the recipient are replaced by residues from a hypervariable region of a non-human species (donor antibody) such as mouse, rat, rabbit or non-human primate having the desired specificity, affinity, and capacity. In some instances, framework region (FR) residues of the human immunoglobulin are replaced by corresponding non-human residues. Furthermore, humanized antibodies may comprise residues that are not found in the recipient antibody or in the donor antibody. These modifications are made further to refine antibody performance. In general, the humanized antibody will comprise substantially all of at least one, and typically two, variable domains, in which all or substantially all of the hypervariable loops correspond to those of a non-human immunoglobulin and all or substantially all of the FRs are those of a human immunoglobulin sequence. The humanized antibody optionally also will comprise at least a portion of an immunoglobulin constant region (Fc), typically that of a human immunoglobulin. For further details, see Jones et al., Nature, 321:522-525 (1986); Riechmann et al., Nature, 332:323-329 (1988); and Presta, Curr. Op. Struct. Biol., 2:593-596 (1992). In one embodiment, a humanized 5C3 antibody is provided and used the methods provided herein. The term “variable” refers to the fact that certain portions of the variable domains differ extensively in sequence among antibodies and are used in the binding and specificity of each particular antibody for its particular antigen. However, the variability is not evenly distributed throughout the variable domains of antibodies. It is concentrated in three segments called hypervariable regions in both the light-chain and the heavy-chain variable domains. The more highly conserved portions of variable domains are called the framework regions (FRs). The variable domains of native heavy and light chains each comprise four FRs, largely adopting a β-sheet configuration, connected by three hypervariable regions, which form loops connecting, and in some cases forming part of, the β-sheet structure. The hypervariable regions in each chain are held together in close proximity by the FRs and, with the hypervariable regions from the other chain, contribute to the formation of the antigen-binding site of antibodies (see Kabat et al., Sequences of Proteins of Immunological Interest, 5th Ed. Public Health Service, National Institutes of Health, Bethesda; Md. (1991)). The constant domains are not involved directly in binding an antibody to an antigen, but exhibit various effector functions, such as participation of the antibody in antibody-dependent cellular cytotoxicity (ADCC). Papain digestion of antibodies produces two identical antigen-binding fragments, called “Fab” fragments, each with a single antigen-binding site, and a residual “Fc” fragment, whose name reflects its ability to crystallize readily. Pepsin treatment yields an F(ab′)2 fragment that has two antigen-binding sites and is still capable of cross-linking antigen. “Fv” is the minimum antibody fragment that contains a complete antigen-recognition and antigen-binding site. This region consists of a dimer of one heavy-chain and one light-chain variable domain in tight, non-covalent association. It is in this configuration that the three hypervariable regions of each variable domain interact to define an antigen-binding site on the surface of the VH-VL dimer. Collectively, the six hypervariable regions confer antigen-binding specificity to the antibody. However, even a single variable domain (or half of an Fv comprising only three hypervariable regions specific for an antigen) has the ability to recognize and bind antigen, although at a lower affinity than the entire binding site. The Fab fragment also contains the constant domain of the light chain and the first constant domain (CH1) of the heavy chain. Fab′ fragments differ from Fab fragments by the addition of a few residues at the carboxy terminus of the heavy-chain CH1 domain including one or more cysteines from the antibody hinge region. Fab′-SH is the designation herein for Fab′ in which the cysteine residue(s) of the constant domains bear at least one free thiol group. F(ab′)2 antibody fragments originally were produced as pairs of Fab′ fragments that have hinge cysteines between them. Other chemical couplings of antibody fragments are also known. The “light chains” of antibodies (immunoglobulins) from any vertebrate species can be assigned to one of two clearly distinct types, called kappa (κ) and lambda (λ), based on the amino acid sequences of their constant domains. Depending on the amino acid sequence of the constant domain of their heavy chains, antibodies can be assigned to different classes. There are five major classes of intact antibodies: IgA, IgD, IgE, IgG, and IgM, and several of these may be further divided into subclasses (isotypes), e.g., IgG1, IgG2, IgG3, IgG4, IgA, and IgA2. The heavy-chain constant domains that correspond to the different classes of antibodies are called α, δ, ε, γ and μ, respectively. The subunit structures and three-dimensional configurations of different classes of immunoglobulins are well known. “Single-chain Fv” or “scFv” antibody fragments comprise the VH and VL domains of antibody, wherein these domains are present in a single polypeptide chain. Preferably, the Fv polypeptide further comprises a polypeptide linker between the VH and VL domains that enables the scFv to form the desired structure for antigen binding. For a review of scFv, see Pluckthun in The Pharmacology of Monoclonal Antibodies, vol. 113, Rosenburg and Moore eds., Springer-Verlag, New York, pp. 269-315 (1994). The term “hypervariable region” when used herein refers to the amino acid residues of an antibody that are responsible for antigen binding. The hypervariable region comprises amino acid residues from a “complementarity-determining region” or “CDR” (e.g. residues 24-34 (L1), 50-56 (L2) and 89-97 (L3) in the light-chain variable domain and 31-35 (H1), 50-65 (H2) and 95-102 (H3) in the heavy-chain variable domain; Kabat et al., Sequences of Proteins of Immunological Interest, 5th Ed. Public Health Service, National Institutes of Health, Bethesda, Md. (1991)) and/or those residues from a “hypervariable loop” (e.g. residues 26-32 (L1), 50-52 (L2) and 91-96 (L3) in the light-chain variable domain and 26-32 (H1), 53-55 (H2) and 96-101 (H3) in the heavy-chain variable domain; Chothia and Lesk J. Mol. Biol. 196:901-917 (1987)). “Framework” or “FR” residues are those variable domain residues other than the hypervariable region residues as herein defined. “Mammal” for purposes of treatment refers to any animal classified as a mammal, including humans, domestic, and farm animals, and zoo, sports, or pet animals, such as dogs, horses, cats, sheep, pigs, cows, etc. Preferably, the mammal is human. The terms “cancer”, “cancerous”, and “malignant” refer to or describe the physiological condition in mammals that is typically characterized by unregulated cell growth. Examples of cancer include but are not limited to, carcinoma including adenocarcinoma, lymphoma, blastoma, melanoma, sarcoma, and leukemia. More particular examples of such cancers include squamous cell cancer, lung cancer (including small-cell lung cancer, non-small cell lung cancer, adenocarcinoma of the lung, and squamous carcinoma of the lung), cancer of the peritoneum, hepatocellular cancer, gastric or stomach cancer (including gastrointestinal cancer), gastrointestinal stromal cancer, pancreatic cancer, glioblastoma, cervical cancer, ovarian cancer, liver cancer (e.g., hepatic carcinoma and hepatoma), bladder cancer, hepatoma, breast cancer, colon cancer, colorectal cancer, rectal cancer, endometrial or uterine carcinoma, salivary gland carcinoma, kidney or renal cancer, liver cancer, prostate cancer, vulval cancer, thyroid cancer, basal cell carcinoma, testicular cancer, esophageal cancer, hepatic carcinoma, soft-tissue sarcoma, kaposi's sarcoma, carcinoid carcinoma, mesothelioma, multiple myeloma, and various types of head and neck cancer, as well as B-cell lymphoma (including low grade/follicular non-Hodgkin's lymphoma (NHL); small lymphocytic (SL) NHL; intermediate grade/follicular NHL; intermediate grade diffuse NHL; high grade immunoblastic NHL; high grade lymphoblastic NHL; high grade small non-cleaved cell NHL; bulky disease NHL; mantle cell lymphoma; AIDS-related lymphoma; and Waldenstrom's Macroglobulinemia); Hodgkin's lymphoma, chronic lymphocytic leukemia (CLL), acute lymphoblastic leukemia (ALL), Hairy cell leukemia; chronic myeloblastic leukemia, and post-transplant lymphoproliferative disorder (PTLD), as well as abnormal vascular proliferation associated with phakomatoses, edema (such as that associated with brain tumors), and Meigs' syndrome. The phrases “vascular” and “cardiovascular” are used interchangeably and describe patients with indications that stimulate angiogenesis and/or cardiovascularization, and those that inhibit angiogenesis and/or cardiovascularization. Such disorders include, for example, arterial disease, such as atherosclerosis, hypertension, inflammatory vasculitis, Reynaud's disease and Reynaud's phenomenon, aneurysms, and arterial restenosis; venous and lymphatic disorders such as thrombophlebitis, lymphangitis, and lymphedema; and other vascular disorders such as peripheral vascular disease, AMD, cancer such as vascular tumors, e.g., hemangioma (capillary and cavernous), glomus tumors, telangiectasia, bacillary angiomatosis, hemangioendothelioma, angiosarcoma, hemangiopericytoma, Kaposi's sarcoma, lymphangioma, and lymphangiosarcoma, tumor angiogenesis, trauma such as wounds, burns, and other injured tissue, implant fixation, scarring, ischemia reperfusion injury, rheumatoid arthritis, cerebrovascular disease, renal diseases such as acute renal failure, and osteoporosis. This would also include angina, myocardial infarctions such as acute myocardial infarctions, cardiac hypertrophy, and heart failure such as congestive heart failure (CHF). The term “diabetes” refers to a progressive disease of carbohydrate metabolism involving inadequate production or utilization of insulin and is characterized by hyperglycemia and glycosuria. This term includes all forms of diabetes, such as type I and type II diabetes and insulin-resistant diabetes, such as Mendenhall's Syndrome, Werner Syndrome, leprechaunism, lipoatrophic diabetes, and other lipoatrophies. The term “affinity purified” refers to purifying a substance by eluting it through an affinity chromatography column. ELISA Vascular endothelial growth factor (VEGF) is a homodimeric glycoprotein and is a key angiogenic factor of blood vessel formation during development and in pathological angiogenesis associated with tumors. Expression of VEGF is potentiated in response to hypoxia, and potentially other factors such as growth factors, hormones and oncogenes. (see, e.g., Ferrara N: Vascular endothelial growth factor: Basic science and clinical progress. Endocrine Reviews 25: 581-611 (2004)). The human VEGF gene has eight exons separated by introns. Alternative RNA splicing results in the generation of at least four major isoforms having 121, 165, 189 and 206 amino acids in monomer (see, e.g., Houck K A, et al.: The vascular endothelial growth factor family: identification of a fourth molecular species and characterization of alternative splicing of RNA. Mol Endocrinol 5: 1806-1814 (1991); and, Tischer E, et al.: The human gene for vascular endothelial growth factor. Multiple protein forms are encoded through alternative exon splicing. J Biol Chem 266: 11947-11954 (1991)). Less frequent isoforms including those having 145 (see, e.g., Poltorak Z., et al.: VEGF145, a secreted vascular endothelial growth factor isoform that binds to extracellular matrix. J Biol Chem 272: 7151-7158 (1997)) and 183 (see, e.g., Jingjing L, et al.: Human Muller cells express VEGF183, a novel spliced variant of vascular endothelial growth factor. Invest Opthalmol V is Sci 40:752-759 (1999)) amino acids in monomer have also been reported. All VEGF isoforms bind two receptor tyrosine kinases, VEGFR-1 (see, e.g., De Vries C, et al.: The fms-like tyrosine kinase, a receptor for vascular endothelial growth factor. Science 255:989-991 (1992)) and VEGFR-2 (see, e.g., Terman B I, et al.: Identification of a new endothelial cell growth factor receptor tyrosine kinase. Oncogene 6:1677-1683 (1991)). VEGF165 also interacts with neuropilin (see, e.g., Soker S. et al.: Neuropilin-1 is expressed by endothelial and tumor cells as an isoform-specific receptor for vascular endothelial growth factor. Cell 92: 735-745 (1998)). VEGF189 and VEGF206 bind to heparin with a high affinity and are mostly sequestered in the extracellular matrix (ECM). VEGF165 binds to heparin with intermediate affinity and is partially soluble and partially bound to cell surface and ECM. VEGF121 does not bind to heparin and is freely soluble. VEGF121 and VEGF165 were found to be the most dominantly expressed variants in breast and ovarian cancer tumor specimens and cell lines by reverse transcription-PCR analysis, while VEGF206 expression was not detected. VEGF183 and VEG189 expression was found to be non-detectable or at low levels in the cell lines and were detected in some of the tumor specimens (see, e.g., Stimpfl M, et al.: Vascular Endothelial growth factor splice variants and their prognostic value in breast and ovarian cancer. Clinical Cancer Research 8: 2253-2259 (2002)). Active VEGF fragment can be released from ECM-bound VEGF by plasmin cleavage, generating the first 110 amino acids (see, e.g., Keyt B A, et al., The carboxyl-terminal domain (111-165) of vascular endothelial growth factor is critical for its mitogenic potency. J Biol. Chem. 271: 7788-7795 (1996)). This could be a mechanism to locally regulate the bioavailability of VEGF during physiological and pathological processes of angiogenesis. See, e.g., Houck K A, et al. Dual regulation of vascular endothelial growth factor bioavailability by genetic and proteolytic mechanisms. J Biol Chem 1992; 267:(310)318-6650 (1992); Keyt B A, et al. The carboxy-terminal domain (111-165) of vascular endothelial growth factor is critical for its mitogenic potency. J Biol. Chem. 271:7788-7795 (1996); and, Roth D, et al. Plasmin modulates vascular endothelial growth factor-A-mediated angiogenesis during wound repair. Am Pathology 168: 670-684. (10-12) (2006). However, VEGF110 concentrations in biological samples have not been reported. Active VEGF fragments may also be released from ECM-bound VEGF by matrix metalloproteinase (MMP) cleavage. This is supported by the finding of degraded VEGF fragments with amino acids additional to 1-110 in ascites from ovarian cancer patients. Both plasmin and MMP3 were detected in the ascites. See, e.g., Lee S, Shahla M J, et al. Processing of VEGF-A by matrix metalloproteinases regulates bioavailability and vascular patterning in tumors. J Cell Biology 169:681-691 (2005). Enzyme-linked immunosorbent assays (ELISAs) for various antigens include those based on colorimetry, chemiluminescence, and fluorometry. ELISAs have been successfully applied in the determination of low amounts of drugs and other antigenic components in plasma and urine samples, involve no extraction steps, and are simple to carry out. The assay described herein is an ELISA that utilizes antibodies as capture reagents and detectable antibodies for VEGF and VEGF110+. In certain embodiments, the ELISA is cell-based. In the first step of the assay the biological sample suspected of containing VEGF or containing VEGF110+ is contacted and incubated with the capture (or coat) antibodies so that the capture antibodies capture or bind to the VEGF or VEGF110+ so that it can be detected in a detection step. The detection step involves use of the detectable antibody, which, when contacted with any of the bound VEGF or VEGF110+, binds to the protein of interest, if present, and a detection means is used to detect the label on the antibody and hence the presence or amount of VEGF or VEGF110+ present. This ELISA can be compared with an ELISA that recognizes total VEGF (e.g., U.S. Pat. No. 6,855,508; those described herein, and those known in the art) or isoforms of VEGF to determine the type of VEGF present. For example, in certain embodiments, the assay utilizes the following steps. First Step In the first step of the assay herein, the biological sample is contacted and incubated with the immobilized capture (or coat) reagent, which is an anti-VEGF monoclonal antibody. This antibody may be from any species, but preferably the monoclonal antibody is a murine or rat monoclonal antibody, more preferably murine, and most preferably MAb 5C3 derived from the hybridoma identified herein. Hence, in a specific preferred embodiment, the immobilized monoclonal antibody is a murine monoclonal antibody, most preferably MAb 5C3. Immobilization conventionally is accomplished by insolubilizing the capture reagent either before the assay procedure, as by adsorption to a water-insoluble matrix or surface (U.S. Pat. No. 3,720,760) or non-covalent or covalent coupling (for example, using glutaraldehyde or carbodiimide cross-linking, with or without prior activation of the support with, e.g., nitric acid and a reducing agent as described in U.S. Pat. No. 3,645,852 or in Rotmans et al. J. Immunol. Methods 57:87-98 (1983)), or afterward, e.g., by immunoprecipitation. The solid phase used for immobilization may be any inert support or carrier that is essentially water insoluble and useful in immunometric assays, including supports in the form of, e.g., surfaces, particles, porous matrices, etc. Examples of commonly used supports include small sheets, Sephadex, polyvinyl chloride, plastic beads, and assay plates or test tubes manufactured from polyethylene, polypropylene, polystyrene, and the like including 96-well microtiter plates, as well as particulate materials such as filter paper, agarose, cross-linked dextran, and other polysaccharides. Alternatively, reactive water-insoluble matrices such as cyanogen bromide-activated carbohydrates and the reactive substrates described in U.S. Pat. Nos. 3,969,287; 3,691,016; 4,195,128; 4,247,642; 4,229,537; and 4,330,440 are suitably employed for capture reagent immobilization. In one embodiment the immobilized capture reagent is coated on a microtiter plate, and in particular the preferred solid phase used is a multi-well microtiter plate that can be used to analyze several samples at one time, e.g., a microtest 96-well ELISA plate such as that sold as Nune Maxisorb or Immulon. In certain embodiments, the plate is a MICROTEST™ or MAXISORP™ 96-well ELISA plate such as that sold as NUNC MAXISORB™ or IMMULON™. The solid phase is coated with the capture reagent as defined above, which may be linked by a non-covalent or covalent interaction or physical linkage as desired. Techniques for attachment include those described in U.S. Pat. No. 4,376,110 and the references cited therein. If covalent, the plate or other solid phase is incubated with a cross-linking agent together with the capture reagent under conditions well known in the art, e.g., such as for 1 hour at room temperature. Commonly used cross-linking agents for attaching the capture reagent to the solid phase substrate include, e.g., 1,1-bis(diazoacetyl)-2-phenylethane, glutaraldehyde, N-hydroxy-succinimide esters, for example, esters with 4-azido-salicylic acid, homobifunctional imidoesters, including disuccinimidyl esters such as 3,3′-dithiobis-(succinimidyl-propionate), and bifunctional maleimides such as bis-N-maleimido-1,8-octane. Derivatizing agents such as methyl-3-[(p-azidophenyl)-dithio]pro-pioimi-date yield photoactivatable intermediates capable of forming cross-links in the presence of light. If 96-well plates are utilized, they are typically coated with the capture reagent (typically diluted in a buffer such as 0.05 M sodium carbonate by incubation for at least about 10 hours, more preferably at least overnight, at temperatures of about 4-20° C., or about 4-8° C., and at a pH of about 8-12, or about pH 9-10, or about pH 9.6). If shorter coating times are desired, one can coat, e.g., 96-well plates at room temperature for two hours. The plates may be stacked and coated long in advance of the assay itself, and then the assay can be carried out simultaneously on several samples in a manual, semi-automatic, or automatic fashion, such as by using robotics. The coated plates are then typically treated with a blocking agent that binds non-specifically to and saturates the binding sites to prevent unwanted binding of the free ligand to the excess sites on the wells of the plate. Examples of appropriate blocking agents for this purpose include, e.g., gelatin, bovine serum albumin, egg albumin, casein, and non-fat milk. The blocking treatment typically takes place under conditions of ambient temperatures for about 1-4 hours, preferably about 1 to 3 hours, or overnight at 0-4° C. After coating and blocking, the VEGF standard (purified VEGF) or the biological sample to be analyzed, appropriately diluted, is added to the immobilized phase. The preferred dilution rate is about 1-15%, preferably about 10%, by volume. Buffers that may be used for dilution for this purpose include (a) PBS containing 0.5% BSA, 0.05% TWEEN 20™ detergent (P20), 0.05% PROCLIN™ 300 antibiotic, 5 mM EDTA, 0.25% Chaps surfactant, 0.2% beta-gamma globulin, and 0.35M NaCl, pH 7.4; (b) PBS containing 0.5% bovine serum albumin, 0.05% polysorbate 20, 5 mM EDTA, 0.25% CHAPS, 0.2% bovine γ-globulins, and 0.35 M NaCl; pH 7.4 (c) PBS containing 0.5% BSA, 0.05% polysorbate 20 (P20), and 0.05% PROCLIN™ 300, pH 7; (d) PBS containing 0.5% BSA, 0.05% P20, 0.05% PROCLIN™ 300, 5 mM EDTA, and 0.35 M NaCl, pH 6.35; (e) PBS containing 0.5% BSA, 0.05% P20, 0.05% PROCLIN™ 300, 5 mM EDTA, 0.2% beta-gamma globulin, and 0.35 M NaCl, pH 7.4; and (f) PBS containing 0.5% BSA, 0.05% P20, 0.05% PROCLIN™ 300, 5 mM EDTA, 0.25% Chaps, and 0.35 M NaCl, pH 7.4. PROCLIN™ 300 acts as a preservative, and TWEEN 20™ acts as a detergent to eliminate non-specific binding. While the concentration of the capture reagents will generally be determined by the concentration range of interest of the VEGF taking any necessary dilution of the biological sample into account, the final concentration of the capture reagent will normally be determined empirically to maximize the sensitivity of the assay over the range of interest. The conditions for incubation of sample and immobilized capture reagent are selected to maximize sensitivity of the assay and to minimize dissociation. Preferably, the incubation is accomplished at fairly constant temperatures, ranging from about 0° C. to about 40° C., preferably from about 20 to 25° C. The time for incubation depends primarily on the temperature, being generally no greater than about 10 hours to avoid an insensitive assay. Preferably, the incubation time is from about 0.5 to 3 hours, and more preferably 1.5-3 hours at room temperature to maximize binding of free VEGF110+ or VEGF to capture reagents. The duration of incubation may be longer if a protease inhibitor is added to prevent proteases in the biological fluid from degrading the VEGF. At this stage, the pH of the incubation mixture will ordinarily be in the range of about 4-9.5, preferably in the range of about 6-9, more preferably about 7-8, and most preferably the pH of the assay (ELISA) diluent is pH 7.4. The pH of the incubation buffer is chosen to maintain a significant level of specific binding of the capture reagent to the VEGF110+ or VEGF being captured. Various buffers may be employed to achieve and maintain the desired pH during this step, including borate, phosphate, carbonate, Tris-HCl or Tris-phosphate, acetate, barbital, and the like. The particular buffer employed is not critical to the invention, but in individual assays one buffer may be preferred over another. Second Step In the second step of the assay method herein, which is optional, the biological sample is separated (preferably by washing) from the immobilized capture reagent to remove uncaptured molecules. The solution used for washing is generally a buffer (“washing buffer”) with a pH determined using the considerations and buffers described above for the incubation step, with a preferable pH range of about 6-9. The washing may be done three or more times. The temperature of washing is generally from refrigerator to moderate temperatures, with a constant temperature maintained during the assay period, typically from about 0-40° C., more preferably about 4-30° C. For example, the wash buffer can be placed in ice at 4° C. in a reservoir before the washing, and a plate washer can be utilized for this step. A cross-linking agent or other suitable agent may also be added at this stage to allow the now-bound VEGF110+ or VEGF to be covalently attached to the capture reagent if there is any concern that the captured VEGF110+ or VEGF may dissociate to some extent in the subsequent steps. Third Step In the next step, the immobilized capture reagent is contacted with detectable antibodies, preferably at a temperature of about 20-40° C., more preferably about 20-25° C., with the exact temperature and time for contacting the two being dependent primarily on the detection means employed. For example, when streptavidin-peroxidase and 3,3′,5,5′-tetramethyl benzidine are used as the means for detection, e.g., in one embodiment, the contacting is carried out (e.g., about 1 hour or more) to amplify the signal to the maximum. Preferably a molar excess of an antibody with respect to the maximum concentration of free VEGF110+ or VEGF expected (as described above) is added to the plate after it is washed. This antibody is directly or indirectly detectable. While the detectable antibody may be a polyclonal or monoclonal antibody, e.g., in certain embodiments, it is a monoclonal antibody, in one embodiment murine, and in one embodiment MAb A4.6.1. Also, the detectable antibody can be directly detectable, and in one embodiment has a colorimetric label, and in another embodiment has a fluorometric label. More preferably, the detectable antibody is biotinylated and the detection means is avidin or streptavidin-peroxidase and 3,3′,5,5′-tetramethyl benzidine. The readout of the detection means can be fluorimetric or colorimetric. The affinity of the antibody must be sufficiently high that small amounts of the free VEGF110+ or VEGF can be detected, but not so high that it causes the VEGF110+ or VEGF to be pulled from the capture reagents. Fourth Step In the last step of the assay method, the level of free VEGF that is now bound to the capture reagent is measured using a detection means for the detectable antibody. If the biological sample is from a vascular, diabetic, or cancer patient, the measuring step preferably comprises comparing the reaction that occurs as a result of the above three steps with a standard curve to determine the level of VEGF110+ or VEGF compared to a normal individual, or preferably comprises comparing the reaction that occurs as a result of the above three steps with an another VEGF ELISA recognizing different isoforms or total VEGF to determine the level of the types of VEGF when the ELISAs are compared, and optionally compared to a normal individual. Antibody Production Polyclonal antibodies to the VEGF generally are raised in animals by multiple subcutaneous (sc) or intraperitoneal (ip) injections of the VEGF and an adjuvant. It may be useful to conjugate the VEGF or a fragment containing the target amino acid sequence to a protein that is immunogenic in the species to be immunized, e.g., keyhole limpet hemocyanin, serum albumin, bovine thyroglobulin, or soybean trypsin inhibitor using a bifunctional or derivatizing agent, for example, maleimidobenzoyl sulfosuccinimide ester (conjugation through cysteine residues), N-hydroxysuccinimide (through lysine residues), glutaraldehyde, succinic anhydride, SOCl2, or R1N═C═NR, where R and R1 are different alkyl groups. The antibodies used as the coat or detectable antibodies may be obtained from any convenient vertebrate source, such as murine, primate, lagomorpha, goat, rabbit, rat, chicken, bovine, ovine, equine, canine, feline, or porcine. Chimeric or humanized antibodies may also be employed, as described, e.g., in U.S. Pat. No. 4,816,567; Morrison et al. Proc. Natl. Acad. Sci. USA 81:6851 (1984); Neuberger et al. Nature 312: 604 (1984); Takeda et al. Nature 314:452 (1985); and WO 98/45331 published Oct. 15, 1998, as well as in those additional references set forth above. Animals may be immunized against the immunogenic conjugates or derivatives by combining 1 mg or 1 μg of conjugate (for rabbits or mice, respectively) with 3 volumes of Freund's complete adjuvant and injecting the solution intradermally at multiple sites. One month later the animals are boosted with ⅕ to 1/10 the original amount of conjugate in Freund's incomplete adjuvant by subcutaneous injection at multiple sites. 7 to 14 days later animals are bled and the serum is assayed for anti-VEGF titer. Animals are boosted until the titer plateaus. Preferably, the animal is boosted with the conjugate of VEGF, but conjugated to a different protein and/or through a different cross-linking agent. Conjugates also can be made in recombinant cell culture as protein fusions. Also, aggregating agents such as alum are used to enhance the immune response. Methods for the production of polyclonal antibodies are described in numerous immunology textbooks, such as Davis et al. Microbiology, 3rd Edition, (Harper & Row, New York, N.Y., 1980). Monoclonal antibodies are prepared by recovering spleen cells from immunized animals and immortalizing the cells in conventional fashion, e.g. by fusion with myeloma cells or by Epstein-Barr virus transformation, and screening for clones expressing the desired antibody. See, e.g., Kohler and Milstein Eur. J. Immunol. 6:511 (1976). Monoclonal antibodies, or the antigen-binding region of a monoclonal antibody, such as Fab or (Fab)2 fragments, may alternatively be produced by recombinant methods. Examples of suitable antibodies include those already utilized in known RIAs for the protein in question, e.g., those antibodies directed against VEGF as described in the references given in the introduction herein. In certain embodiments, an anti-VEGF antibody 5C3, which is obtainable from or produced by hybridoma deposited under ATCC number PTA-7737, is used, optionally with another anti-VEGF antibody, A4.6.1. The invention also provides an antibody that does not bind VEGF 1-110 and binds to the same VEGF110+ epitope as the monoclonal antibody produced by hybridoma cell line PTA-7737. A hybridoma 5C3.1.1 deposited under ATCC deposit number PTA-7737 is provided. Detection The antibody added to the immobilized capture reagents will be either directly labeled, or detected indirectly by addition, after washing off of excess first antibody, of a molar excess of a second, labeled antibody directed against IgG of the animal species of the first antibody. In the latter, indirect assay, labeled antisera against the first antibody are added to the sample so as to produce the labeled antibody in situ. The label used for either the first or second antibody is any detectable functionality that does not interfere with the binding of free VEGF110+ or VEGF to the antibody. Examples of suitable labels are those numerous labels known for use in immunoassay, including moieties that may be detected directly, such as fluorochrome, chemiluminescent, and radioactive labels, as well as moieties, such as enzymes, that must be reacted or derivatized to be detected. Examples of such labels include the radioisotopes 32P, 14C, 125I, 3H, and 131I, fluorophores such as rare earth chelates or fluorescein and its derivatives, rhodamine and its derivatives, dansyl, umbelliferone, luciferases, e.g., firefly luciferase and bacterial luciferase (U.S. Pat. No. 4,737,456), luciferin, 2,3-dihydrophthalazinediones, horseradish peroxidase (HRP), alkaline phosphatase, β-galactosidase, glucoamylase, lysozyme, saccharide oxidases, e.g., glucose oxidase, galactose oxidase, and glucose-6-phosphate dehydrogenase, heterocyclic oxidases such as uricase and xanthine oxidase, coupled with an enzyme that employs hydrogen peroxide to oxidize a dye precursor such as HRP, lactoperoxidase, or microperoxidase, biotin/avidin, biotin/streptavidin, biotin/Streptavidin-β-galactosidase with MUG, spin labels, bacteriophage labels, stable free radicals, and the like. As noted above, the fluorimetric detection is one example. Conventional methods are available to bind these labels covalently to proteins or polypeptides. For instance, coupling agents such as dialdehydes, carbodiimides, dimaleimides, bis-imidates, bis-diazotized benzidine, and the like may be used to tag the antibodies with the above-described fluorescent, chemiluminescent, and enzyme labels. See, for example, U.S. Pat. No. 3,940,475 (fluorimetry) and U.S. Pat. No. 3,645,090 (enzymes); Hunter et al. Nature 144:945 (1962); David et al. Biochemistry 13:1014-1021 (1974);
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