Inhibition of growth stimulating activity of rhu IL-2 on the mouse cell line CTTL-2 by recombinant chimeric protein. The data are results from 3 independent experiments. The observed difference proved to be statistically different (p < 0.05) by the Kruskal-Wallis test. IL-2 dilution 1:40 000 correspond to 25 IU/mL (2.8 ng/mL). Group1: IL-2, group 2: IL-2 + TH1 antagonist. Results expressed in international units of IL-2 where 1 IU is defined as the amount of IL-2 that elicits a 50% increase in cell growth in a cell base bioassay.