Growth inhibition of MT2, S1T, and Jurkat cells by sodium arsenite. Proliferation of MT2 (A), S1T (B), and Jurkat (C) cells in the absence or presence of the indicated concentrations of sodium arsenite was assessed by MTT assay. (D) The sodium arsenite toxicity in MT2, S1T, and Jurkat cells was determined by an MTT assay. The points represent the means of triplicate determinations, while the bars show SD.