Recombinant Human Interleukin 2 (IL-2) contains 134 AAs^ Recombinant Human Interleukin 2 (IL-2) contains 134 AAs, with a MW of 15.5 kDa. Activity: dose-dependent proliferation of CTLL-2 cells and is typically less than 1 ng/mL. Source: E.coli, Synonyms: T cell growth factor, TCGF, Aldesleukin, 1MG