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(A) RT-PCR analysis of Bax, Bcl-2 and caspase-3 expression. (B) Western-blot analysis of Bax, Bcl-2 and caspase-3 expression. (C) Relative intensity of expression obtained by RT-PCR. (D) Relative intensity expression obtained by western-blot. Error bars represent the S.D. from the mean of three separate experiments. *P<0.05 and **P<0.01 compared with As3+ and As4S4 combination treated cells.
