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In vitro bioactivity of rhIL-15, IL-15/SuIL-15Rα-dFc and IL-15/SuIL-15Rα-mFc. A CTLL-2 cell proliferation assay was used to evaluate the biological activity of the rhIL-15 and IL-15/SuIL-15Rα-IgG4 Fc complexes. The EC50 values were calculated using the four-parameter nonlinear logistic regression model. All data points are the means ± standard deviation of triplicate OD values. The results are representative of at least three experiments
