Fig. 1

PSO inhibits OS cell proliferation in vitro. a Chemical structures of PSO. The effect of PSO on the proliferation of human OS cells was detected by crystal violet staining b–e and EdU staining f–i. Western blot analysis showed that PSO downregulated PCNA. PSO significantly inhibited the proliferation of OS cells j–m (*P < 0.05, ***P < 0.001, ****P < 0.0001 vs. the control group, n = 3)