purinoceptor Purinergic receptor P2Y10 (, P2Y10) Protease-activated receptor Coagulation factor II (thrombin) receptor-like 1 (, PAR2) Coagulation factor II (thrombin) receptor-like 2 (, PAR3) Coagulation factor II (thrombin) receptor-like 3 (, PAR4) Epstein-Barr virus induced gene 2 (lymphocyte-specific G protein-coupled receptor) () Proton-sensing G protein-coupled receptors GPR4 () GPR65 () GPR68 () GPR132 (, G2A) GPR17 (, GPRH) GPR18 (, GPRI) GPR20 (, GPRK) GPR35 () GPR55 () Coagulation factor II receptor (, THRR) Subfamily A16 Opsins Rhodopsin (, OPSD) Opsin 1 (cone pigments), short-wave-sensitive (color blindness, tritan) (, OPSB) (blue-sensitive opsin) Opsin 1 (cone pigments), medium-wave-sensitive (color blindness, deutan) (, OPSG) (green-sensitive opsin) Opsin 1 (cone pigments), long-wave-sensitive (color blindness, protan) (, OPSR) (red-sensitive opsin) Opsin 3, Panopsin () Opsin 4, Melanopsin () Opsin 5 (, GPR136) Retinal G protein coupled receptor () Retinal pigment epithelium-derived rhodopsin homolog (, OPSX) (visual pigment-like receptor opsin) Subfamily A17 5-Hydroxytryptamine (5-HT) receptor 5-HT2A (, 5H2A) 5-HT2B (, 5H2B) 5-HT2C (, 5H2C) 5-HT6 (, 5H6) Adrenergic receptor Alpha1A (, A1AA) Alpha1B (, A1AB) Alpha1D (, A1AD) Alpha2A (, A2AA) Alpha2B (, A2AB) Alpha2C (, A2AC) Beta1 (, B1AR) Beta2 (, B2AR) Beta3 (, B3AR) Dopamine receptor D1 (, DADR) D2 (, D2DR) D3 (, D3DR) D4 (, D4DR) D5 (, DBDR) Trace amine receptor TAAR1 (, TAR1) TAAR2 (, GPR58) TAAR3 (, GPR57) TAAR5 (, PNR) TAAR6 (, TAR4) TAAR8 (, GPR102) TAAR9 (, TAR3) Histamine H2 receptor (, HH2R) Subfamily A18 Histamine H1 receptor (, HH1R) Histamine H3 receptor () Histamine H4 receptor () Adenosine receptor A1 (, AA1R) A2a (, AA2A) A2b (, AA2B) A3 (, AA3R) Muscarinic acetylcholine receptor M1 (, ACM1) M2 (, ACM2) M3 (, ACM3) M4 (, ACM4) M5 (, ACM5) GPR21 (, GPRL) GPR27 () GPR45 (, PSP24) GPR52 () GPR61 () GPR62 () GPR63 () GPR78 () GPR84 () GPR85 () GPR88 () GPR101 () GPR161 (, RE2) GPR173 (, SREB3) Subfamily A19 5-Hydroxytryptamine (5-HT) receptor 5-HT1A (, 5H1A) 5-HT1B (, 5H1B) 5-HT1D (, 5H1D) 5-HT1E (, 5H1E) 5-HT1F (, 5H1F) 5-HT4 () 5-HT5A (, 5H5A) 5-HT7 (, 5H7) Unclassified Olfactory receptor Nematode chemoreceptor (multiple, including ） Taste receptor type 2 Vomeronasal receptor type 1 VN1R1 VN1R2 VN1R3 VN1R4 VN1R5 References External links This database includes multiple sequence alignments of all GPCR families and sub-families. G protein-coupled receptors Protein domains Protein families