The MTT assay was used to measure cell proliferation at different concentrations of EGCG. The results show that the inhibitory effect of EGCG on BMSC development was dose- and time-dependent. The experiments were performed in triplicate. Values are means SEMs. Significant difference: **P < 0.01, *P < 0.05. The x-axis shows the EGCG concentrations and the y-axis the percentages of viable cells.