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Synergistic anticancer effect of the combination of berberine and d-limonene in MGC803 cells. The combination index (CI) (A, B) and dose-reduction index (DRI) (C, D) of the combination of berberine and d-limonene were calculated as described. The data points below CI values of 1, denoted by horizontal dotted lines in (A) and (B), are indicative of synergistic effects.
