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Percentage inhibition of cells and dose-dependent cytotoxic effect of Cissus quadrangularis Linn. extract over a concentration range of 25–300 μg/ml against KB cells by 3-(4, 5-dimethyl thizol-2-yl)-2, 5-diphenyl tetrazolium bromide assay at 24 h. IC50 of Cissus quadrangularis extract against KB cells is 200 μg/ml
