 LXA4 and 15-epi-LXA4 are high affinity receptor ligands for and activators of the FPR2 receptor.FPR2, which is now termed the ALX, ALX/FPR, or ALX/FPR2 receptor, is a G protein coupled receptor initially identified as a receptor for the leukocyte chemotactic factor, N-Formylmethionine-leucyl-phenylalanine (FMLP), based on its amino acid sequence similarity to the known FMLP receptor, FPR1.At least six homologues of this receptor are found in mice.