Samples in the normal control group and the model control group were cultured in serum DMEM/F12 (containing 0.2 fetal calf serum) without growth factor for 7 days to induce the differentiation.

• 正常对照组和模型对照组在加入去除生长因子的血清DMEM/F12（含体积分数为0.；2的胎牛血清）中培养7 d进行诱导分化。