Effect of SR10 on PDGF-BB-stimulated proliferation of A7r5 cells. Cells were incubated with PDGF-BB (25 ng/ml) for 24 hours in the absence or presence of various concentrations of SR10. Cells incubated with various concentrations of SR10 without PDGF-BB were used to indicate the cytotoxicity of SR10. After 24 hours, MTT assay was performed to measure the cell viability in different treatments. Percentage of cell viability without treatment of PDGF-BB or SR10 was set as 100% (negative control). Percentage of cell viability of other treatment groups was calculated against negative control. Data are expressed as mean ± S.D. with eight replicates for each of three independent experiments. By Mann-Whitney test, significant difference when compared to PDGF-BB alone was indicated by *p < 0.05 or # p < 0.01.