Tuftsin

**Definition:** N(2)-((1-(N(2)-L-Threonyl)-L-lysyl)-L-prolyl)-L-arginine. A tetrapeptide produced in the spleen by enzymatic cleavage of a leukophilic gamma-globulin. It stimulates the phagocytic activity of blood polymorphonuclear leukocytes and neutrophils in particular. The peptide is located in the Fd fragment of the gamma-globulin molecule.

**Tree numbers:** - D12.644.456.840 - D12.644.541.500.650.750 - D12.776.124.486.485.397.500 - D12.776.124.486.485.680.650.750 - D12.776.124.790.651.397.500 - D12.776.124.790.651.680.650.750 - D12.776.377.715.548.397.500 - D12.776.377.715.548.680.650.750

**Synonyms:** - L-Thr-L-Lys-L-Pro-L-Arg - L-Threonyl-L-Lysyl-L-Prolyl-L-Arginine - Taftsin