Fig. 8. [K⁺]_in and [Na⁺]_in changes in U937 cells treated with 5 µM Gram for 30 min or with 10 µM ouabain (Oua) for 3 h. Data obtained by flame emission assay. Mean ± SD from 3 experiments with duplicate determinations. Dotted lines indicate [Na⁺]_out, [K⁺]_out.