anchor.diff:  
   ///valid character 
   let valid = OptionConverter.charToOptionAminoAcid 'A'
  +(*** include-value:valid ***)
   ///invalid character
   let invalid = OptionConverter.charToOptionAminoAcid '?'
  -
  +(**
  +<pre>None<\pre>
  +*)
   (**
   Which results in 'A' being recognized as `Some Ala` and '?' as `None`.
   
  -To parse our entire string, we can use any of the BioCollections' `ofAminoAcidString` functions. For more information about BioSeq, BioList and BioArray go [here](Biosequences.html)
  +To parse our entire string, we can use any of the BioCollections' `ofAminoAcidString` functions, which use this converter internally. For more information about BioSeq, BioList and BioArray go [here](BioCollections.html)
   *)
   
   ///Protein represented as a Bioseq
   let parsedProtein1 = rawString |> BioSeq.ofAminoAcidString 
  +(*** include-value:parsedProtein1 ***)
   
   ///Protein represented as a BioList
   let parsedProtein2 = rawString |> BioList.ofAminoAcidString 
  +(*** include-value:parsedProtein2 ***)
   
   ///Protein represented as a BioArray
   let parsedProtein3 = rawString |> BioArray.ofAminoAcidString 
  +(*** include-value:parsedProtein3 ***)
   
   (**
   This yields us our Hello World protein. note that the '!' from the raw string is not contained in the sequence as it is not coding for an aminoacid.
   *)
   
  +(**
  +Pretty Printing
  +===============
   
  +Especially when working with longer sequences or multiple sequences, it can be beneficial to overwrite the default printing of biological datastructures.
  +BioFSharp comes with a pretty printer for all BioCollections:
  +*)
   
  +let largerSequence = 
  +    """MASSMLSSATMVASPAQATMVAPFNGLKSSAAFPATRKANNDITSITSNGGRVNCMQVWP
  +    PIGKKKFETLSYLPDLTDSELAKEVDYLIRNKWIPCVEFELEHGFVYREHGNSPGYYDGR
  +    YWTMWKLPLFGCTDSAQVLKEVEECKKEYPNAFIRIIGFDNTRQVQCISFIAYKPPSFT
  +    MASSMLSSATMVASPAQATMVAPFNGLKSSAAFPATRKANNDITSITSNGGRVNCMQVWP
  +    PIGKKKFETLSYLPDLTDSELAKEVDYLIRNKWIPCVEFELEHGFVYREHGNSPGYYDGR
  +    YWTMWKLPLFGCTDSAQVLKEVEECKKEYPNAFIRIIGFDNTRQVQCISFIAYKPPSFT
  +    MASSMLSSATMVASPAQATMVAPFNGLKSSAAFPATRKANNDITSITSNGGRVNCMQVWP
  +    PIGKKKFETLSYLPDLTDSELAKEVDYLIRNKWIPCVEFELEHGFVYREHGNSPGYYDGR
  +    YWTMWKLPLFGCTDSAQVLKEVEECKKEYPNAFIRIIGFDNTRQVQCISFIAYKPPSFT""" 
  +    |> BioArray.ofAminoAcidString
   
  +(*** include-value:largerSequence ***)
  +
  +(** 
  +As you can see here, using the standard printing you are only able to see the first 100 amino acids in this sequence. 
  +Now lets take a look on the output when we use the pretty printer:
  +*)
  +
  +open BioFSharp.FSIPrinters
  +fsi.AddPrinter(prettyPrintBioCollection)
  +
  +(**
  +<pre>
  +val it : BioArray.BioArray<AminoAcids.AminoAcid> =
  +  
  +         1  MASSMLSSAT MVASPAQATM VAPFNGLKSS AAFPATRKAN NDITSITSNG GRVNCMQVWP
  +        61  PIGKKKFETL SYLPDLTDSE LAKEVDYLIR NKWIPCVEFE LEHGFVYREH GNSPGYYDGR
  +       121  YWTMWKLPLF GCTDSAQVLK EVEECKKEYP NAFIRIIGFD NTRQVQCISF IAYKPPSFTM
  +       181  ASSMLSSATM VASPAQATMV APFNGLKSSA AFPATRKANN DITSITSNGG RVNCMQVWPP
  +       241  IGKKKFETLS YLPDLTDSEL AKEVDYLIRN KWIPCVEFEL EHGFVYREHG NSPGYYDGRY
  +       301  WTMWKLPLFG CTDSAQVLKE VEECKKEYPN AFIRIIGFDN TRQVQCISFI AYKPPSFTMA
  +       361  SSMLSSATMV ASPAQATMVA PFNGLKSSAA FPATRKANND ITSITSNGGR VNCMQVWPPI
  +       421  GKKKFETLSY LPDLTDSELA KEVDYLIRNK WIPCVEFELE HGFVYREHGN SPGYYDGRYW
  +       481  TMWKLPLFGC TDSAQVLKEV EECKKEYPNA FIRIIGFDNT RQVQCISFIA YKPPSFT
  +</pre>
  +*)
  
positive.code: 
  (**
  
  BioFSharp comes with various data structures for biological objects such as aminoacids. As you most likely know, you can abbreviate a
  sequence of aminoacids with a three or oneletter code for each single aminoacid. We can convert a character to an aminoacid by using the
  `charToOptionAminoAcid` function from the `BioItemsConverter` library. This will return us an option type, being either an aminoacid or `None` 
  if the caracter is not coding for an aminoacid.
  
negative.code: (**
  Introduction
  ============
  After you have downloaded and set up BioFSharp (as described [here](index.html#Installation)), it is time to see it in action. Since we are programmers, let's say 'Hello World' !  
  
  The focus of this brief tutorial lies on introducing you to the BioFSharp workflow. We will build a protein from a raw string and look at some of it's properties.
  Detailed information about the functions used can be either found in the specific tutorials in the sidebar or the API reference. 
  
  First, we reference and open BioFSharp.
  *)
  //Your path may differ
  #r"BioFSharp.dll"
  
  open BioFSharp
  