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Morphological changes of si-GSTA1 and si-control A549 cells. Apoptotic nuclei manifested condensed or fragmented DNA brightly stained by Hoechst 33258 (magnification, ×100). (a-e) Si-control A549 cells cultured for 1, 2, 3, 4 and 5 days, respectively. (f-j) Si-GSTA1 A549 cells cultured for 1, 2, 3, 4 and 5 days, respectively. GSTA1, glutathione S-transferase A1; si, small interfering RNA.
