Fig. 2

Colony formation of cMGT cell lines after exposure to different concentrations of X.E.E. and X.H.E. Microscope images reveal no apparent colony formation in (a) MPG cells and (b) CMT1 cells after incubation of X.H.E. 5 μg/mL for 14 days. Quantification of the colony number of (c) MPG cells and (d) CMT1 cells in five images is illustrated by bar charts. Each column represents the means ± SDs. *: p < 0.05; **: p < 0.01