Effects of mifepristone and metapristone on viability and morphology of the tested cell lines. Effects of mifepristone and metapristone on cell viability (left) and morphology (right; upper two panels: mifepristone; lower two panels: metapristone) of endometrial RL95-2 (A), endothelial HUVEC (B), embryo JEG-3 (C), and breast MCF-7 (D). The red insets are the amplified (200 folds) photos of the lefts. Some changes in cell morphology were found at 100 µM of drugs. Note, in general, the IC50s of metapristone are higher than those of mifepristone. Data are the mean ± SEM (n = 4).