The MTT assay and the cell viability assay.

<p>(A) The effect of quercetin at different concentrations (0, 1, 2, 5 and 10 μM) on the proliferation of rBMSCs; (B) The cell viability assay analysed by FACS flow cytometer, the lower-left corner represented as the normal living cells, while the upper-left, lower-right and upper-right corners represented as the detection error, early apoptotic cells, necrotic and late apoptotic cells, respectively; (C) Quantitative analysis of the percentage of normal living cells of rBMSCs cultured with quercetin at different concentrations (0, 1, 2, 5 and 10 μM) at 24 hours, the 0 μM group was treated as the control group (0). *p < 0.05 indicates the quercetin-treated groups vs the control group; ▲p < 0.05 indicates the 2 μM group vs the other quercetin groups.