 C5a2 or C5L2), which has the structure of G protein receptors but apparently does not couple to G proteins and is of uncertain function.The FPR1, FPR2, and FPR3 paralogs, based on phylogenetic analysis, originated from a common ancestor with early duplication of FPR1 and FPR2/FPR3 splitting with FPR3 originating from the latest duplication event near the origin of primates.Mice have no less than 7 FPR receptors encoded by 7 genes that localize to chromosome 17A3.2 in the following order