High affinity receptor for N-formyl-methionyl Peptides (FMLP), which are powerful neutrophil chemotactic factors (PubMed: 12218158, PubMed: 10477558, PubMed: 19387439). Stimulates chemotaxis in immune cells to site of infection or tissue damage upon recognition of several ligands, such as FMLP, or ligand involved in cell damage, disease or inflammation (PubMed: 10477558, PubMed: 19497865). Receptor for the chemokine-like protein FAM19A5, mediating FAM19A5-stimulated macrophage chemotaxis and the inhibitory effect on TNFSF11/RANKL-induced osteoclast differentiation (PubMed: 29138422).