Fig. 5From: Correlation between the efficacy of stem cell therapy for osteonecrosis of the femoral head and cell viabilitya-d The hBMSCs from group A had large nuclei and large, obvious nucleoli with an even heterochromatic distribution and rich cytoplasm with intermediate electron density. The hBMSCs from group B had decreased cytoplasmic electron density and numerous vacuoles and autophagosomes of varying size. e Comparison of the time between passages of hBMSCs in groups A and B. * p < 0.05Back to article page