Low affinity receptor for N-formyl-methionyl peptides, which are powerful neutrophil chemotactic factors (By similarity). Binding of FMLP to the receptor causes activation of neutrophils (By similarity). This response is mediated via a G-protein that activates a phosphatidylinositol-calcium second messenger system (By similarity). Receptor for the chemokine-like protein FAM19A5, mediating FAM19A5-stimulated macrophage chemotaxis and the inhibitory effect on TNFSF11/RANKL-induced osteoclast differentiation (By similarity). 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. Belongs to the G-protein coupled receptor 1 family.