N-Formylmethionine leucyl-phenylalanine

N-Formylmethionyl-leucyl-phenylalanine is a formylated tripeptide originally isolated from bacterial filtrates that is positively chemotactic to polymorphonuclear leucocytes, and causes them to release lysosomal enzymes and become metabolically activated.

Chemical name: L-Phenylalanine, N-(N-(N-formyl-L-methionyl)-L-leucyl)-