N-Formyl-Met-Ala-Ser is a peptide that binds to formyl peptide receptors on neutrophils. N-Formylmethionine-containing peptides, including the most potent and well-known member N-formyl-Met-Leu-Phe [FMLP or fMet-Leu-Phe], stimulate human neutrophils through a receptor-dependent mechanism.