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Determination of potential cytotoxic effects of compounds 1, 4, 6, and 7. Digitonin (100 µg/mL, corresponding to 81 µM) was used as positive control, vehicle (0.1% DMSO) with and without PDGF was used as negative control. Values are presented as means ± SD (n = 3). *** p < 0.001, n.s. not significant (ANOVA/Bonferroni).
