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 APP; the interaction takes place at the cell surface and the complex is then rapidly internalized. Associates with APP at the cell surface and the complex is then rapidly internalized. Belongs to the G-protein coupled receptor 1 family.