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Bcl-2 is upregulated following cerebral ischemia and reperfusion in the brain tissue of rats. Immunohistochemical analysis of Bcl-2 expression in (A) the control group, and (B) 3, (C) 6, (D) 12 and (E) 24 h after cerebral ischemia and reperfusion. Bcl-2, apoptosis regulator Bcl-2.