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Caspase-3 and bcl-2 protein expression in the three cell groups (original magnification, ×200). (A) Caspase-3 normal U251; (B) caspase-3 U251-EV; (C) caspase-3 U251-SLC22A18; (D) bcl-2 normal U251; (E) bcl-2 U251-EV; (F) bcl-2 U251-SLC22A18.
