Fig. 2

Evaluation of cytotoxicity of different concentrations of Osteoking on rat bone marrow mesenchymal stem cells. a Cell morphology after culturing with different concentrations of Osteoking for 4 days in bright light. X = dilution multiple of Osteoking. b Cell viability of rat bone marrow mesenchymal stem cells (rbMSCs) treated with different concentrations of Osteoking after 4 days by CCK-8 assay. **p < 0.01, ***p < 0.001 vs. control; n = 5