The well-grown UCBMSCs of the third generation were irradiated by CMF following adherent screening method at different intensities ( The intensity was 0.05,0.1,0.5 and 1.0 mT respectively) for 5 days , 8 h/d.

• 经贴壁筛选法筛选；对生长良好的第3代人脐血间充质干细胞进行恒磁场辐射(强度分别为0.；05；