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Induction of apoptosis in NNK-exposed HBE cells by knockdown of survivin expression. BEAS2B and BEAS2BN90d cells were left untransfected (Con) or were transiently transfected with scrambled siRNA (scr) or survivin siRNA (si-sur) for 1 day and then incubated in the absence of EGF for a further 1 day. These cells were subjected to flow cytometric analysis of cell cycle (A) and cell death (B).
