Fig. 2. A high Bacitracin concentration induces tumor cell apoptosis. A and B : No difference in caspase-3 expression was observed on days 1 and 2 after bacitracin treatment. C : A significant cell death was observed between the 5.0 mM bacitracin and controls group after 3 days. however, 1.25, 2.5, and 3.75 mM bacitracin did not induced significant more cell death. D : A similar result was detected on day 4. ^*p<0.05, ^***p<0.001.