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(A) Western blot analysis of caspase-3, cleaved caspase-9, and PARP after treatment of HeLa cells with 4i at the indicated concentrations and for the indicated times. (B) Western blot analysis of Bcl-XL, survivinThr32, Mcl-1, and XIAP after treatment of HeLa cells with 4i at the indicated concentrations and for the indicated times. To confirm equal protein loading, each membrane was stripped and reprobed with anti-β-actin antibody.
