The formyl peptide receptors (FPRs:-FPR1, FPR2 and FPR3) belong to a class of G protein-coupled receptors that are involved in chemotaxis. They are encoded by separate genes of the same name (see FPR1 gene, FPR2 gene and FPR3 gene below). They are mainly expressed by mammalian phagocytic leukocytes. The FPRs receptor proteins are involved in the antibacterial defense and inflammatory reactions of the host organism.