Method: The effect of different cell density, different concentrations of fetal bovine serum (FBS), EGF and PDGF-BB on hMSCs proliferation was assessed by MTT assay.

• 方法：采用MTT比色法检测不同接种密度、不同浓度的胎牛血清、EGF和PDGF-BB对MSC生长的影响；