"Cyclic polypeptide that suppresses some *humoral immunity* and, to a greater extent, cell-mediated immune reactions (eg, delayed hypersensitivity, allograft rejection, experimental allergic encephalomyelitis, graft versus host disease) for a variety of organs.
For children and adults, base dosing on ideal body weight".

Many online refs. to "humoral immunity" in the context of creatinine, ureea, potassium levels.