Different intensities of EMF stimulation tests: Negative control group, positive control group, EMF 0.4, 0.8 and 1.6 mT stimulation groups were set. Five bottles of cells of the second generation were chosen from each group for test.

• 不同强度电磁场刺激实验:设立阴性对照组、阳性对照组、电磁场0.；4；