IL-2–induced proliferation of CTLL-2 cells was not affected by dexamethasone. CTLL-2 cells (10⁴/well) were incubated with the designated concentrations of rIL-2 for 24 hours. Either 100 nmol/L or 1 μmol/L dexamethasone was included from the start of some cultures. ³H-Thymidine (0.5 μCi/well) was pulsed for the last 6 hours. Data are expressed as the mean of triplicate cultures ± SEM.