It is produced by the strain of Str. sp. K Y 11783. It's an immunosuppressant. It has inhibitory effects on lymphocyte kinase (IC50 is 0.05 μmol/L), and it also inhibits mixed lymphocyte response (IC50 is 0.009 μmol/L). 83 μg/mL of Lymphostin has no effect on the gram-positive bacteria and negative bacteria.