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). Interacts with Amyloid-beta protein 42, product of APP; the interaction takes place at the cell surface and the complex is then rapidly internalized. Associates with Amyloid-beta protein 42, product of APP, at the cell surface and the complex is then rapidly internalized. Primarily expressed in neutrophils. Not detected in vomeronasal neurons. Blocks Fam19a5-stimulated macrophage chemotaxis and phosphorylation of Erk1 and Akt1 (PubMed:29138422). Suppression of Fam19a5-mediated inhibition of Rankl-induced osteoclast differentiation (PubMed:29138422). Belongs to the G-protein coupled receptor 1 family.