Immunogen sequence: YRADLKAVRE KCMALMANDE ESDDETSLEG GISPDLVLER SLDYGYGGDF VALDRMAKYE ISALEGGLPQ LYPLRPLQED KMQYLQVPPT RRFSHDDADV W. G protein-coupled receptors (GPRs), also known as seven transmembrane receptors, heptahelical receptors or 7TM receptors,