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Colony formation area of PC-9, A549 and HCT116 cells treated with different concentrations of aspirin for 7-12 days (n=3, mean ± standard deviation; **P<0.01 vs. control and Effects of MAPK inhibitors on the colony formation of PC-9 cells upon aspirin stimulation). The size of the colony formation area is indirectly expressed through the number of image pixels.
