Immunogen sequence: NTTFVVYENT YMNITLPPPF QHPDLSPLLR YSFETMAPTG LSSLTVNSTA VPTTPAAFKS LNLPLQ. G protein-coupled receptors (GPCRs) contain 7 transmembrane domains and transduce extracellular signals through heterotrimeric G proteins. GPR63 is a member of