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(A) Western blot assay of P21waf1/Cip1, caspase-3, Bax and Bcl-2 protein levels in the three cell lines. (B) Semi-quantitative analysis of (a) Bcl-2, (b) Bax, (c) P21waf1/Cip1 and (d) caspase-3. The protein levels were normalized to β-actin and compared with the control of three independent experiments.
