n formyl met leu phe

N-Formyl-Met-Leu-Phe (N-Formyl-MLF) (fMLF) is a synthetic peptide that acts as an agonist at formyl peptide receptors (FPR; Ki = 0.8 pM).

N-Formyl-Met-Leu-Phe-Lys (fMLFK) is a peptide that acts as a potent and selective agonist of FPR1, with EC50s of 3.5 nM for FPR1, 6.7 μM for FPR2, and 0.88 μM for FPR2-D2817.32G. This chemotactic peptide binds specifically to receptors on leukocyte membranes and its uptake can contribute to the quantitative assessment of neutrophils in localized inflammatory processes, independent of associated edema formation or microcirculatory compromise.

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.