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Concentration selection of the four medicines. The MTT test showed that the IC50 concentrations of baicalin, salvianic acid, puerarin and saikosaponin were 150, 79, 695, and 66.3 µg/ml, respectively. Cell viability curves for (A) baicalin; (B) salvianic acid; (C) puerarin; (D) saikosaponin.
