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Effect of different concentrations of sufentanil on cell viability of cultured SGC-7901 gastric cancer cells after being treated for 6 h, 12 h, 24 h and 48 h. Data are shown as mean ± S.E. (n = 6). Asterisk denotes a response that is significantly different from the control (* p < 0.05, ** p < 0.01)
