tuftsin molecule, structural chemical formula, ball-and-stick model, image tetrapeptide

tuftsin tetrapeptide molecule molecular structure chemical formula isolated model c21h40n8o6 atom chemistry composition domain compound peptide science scientific atomic drawing geometric skeletal icon line flat organic carbon oxygen hydrogen nitrogen carboxypeptidase immunoglobulin leukokinin leukokininase phagocytosis thrlysproarg tkpr microscope antitumor endogenous structural ball- -stick image ball- -stick tetrapeptide