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IL-21 does not inhibit proliferation of B16 and RenCa cells in vitro. B16 cells (filled square) or RenCa cells (square) (3,000/well) were grown in appropriate media and stimulated with the indicated concentrations of IL-21 for 48 h. Absorbance at 450 nm was measured after 2 h incubation with WST-1 proliferation reagent. Mean ± SEM of duplicates
