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Effects of 1 and 12 on the viability of KB-3-1 cells. Cells were incubated for 24 h in the presence of 1 and 12 (0.1, 5 and 10 μm). Cell viability was measured by MTT assay as described in the Experimental Section. The results are expressed as percentages of viable cells observed after treatment with compounds relative to control cells (100 %) incubated in the presence of DMSO (0.1 % (v/v)). The data were obtained from three separate experiments in triplicate.
