The formyl peptide receptors (FPRs) are a group of G protein-coupled chemoattractant receptors that play important roles in host defense and inflammation (PMID: 28335409). In humans, three different isoforms are expressed (FPR1, FPR2, and FPR3). FPR2, also known as FPRL1 or ALX, is expressed by many cell types including monocytes, neutrophils, macrophages, astrocytoma cells, and epithelial cells. FPR2 conveys the biological functions of a variety of ligands, including N-formyl-methionyl peptides, the pro-resolution mediators annexin A1 (AnxA1) and lipoxin A4, as well as the activating and proinflammatory protein serum amyloid A (PMID: 22610094).