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SA anti-tumor effects might mediate by NO pathway. Nitric oxide synthesis activities (a) and inducible nitric oxide synthesis activities (b) were determined by DAF-FMDA method after indicated treatments for 12 h. c Relative mRNA expression level of iNOS (NOS2) and eNOS (NOS3) in Bel-7402 and HepG2 cell line received indicated treatments above for 6 h. Bars denoted by the different letters significantly differed at P <0.05 according to Tukey’s multiple range tests
