 Other previously used names for FPR1 are NFPR, and FMLPR; for FPR2 are FPRH1, FPRL1, RFP, LXA4R, ALXR, FPR2/ALX, HM63, FMLPX, and FPR2A; and for FPR3 are FPRH2, FPRL2, and FMLPY.The human "FPR2" gene encodes the 351 amino acid receptor, FPR2, within an intronless open reading frame.It forms a cluster with "FPR1" and "FPR3" genes on chromosome 19q.13.3 in the order of FPR1, FPR2, and FPR3; this cluster also includes the genes for two other chemotactic factor receptors, the G protein-coupled C5a receptor (also termed CD88) and a second C5a receptor, GPR77 (i.e.