Fig. 4: Histology of bone regeneration at docking sites or regenerate sites in the femoral specimens on POD34 or POD55.

a Representative microphotographs at docking sites. b Representative microphotographs at regenerate sites. Longitudinal sections were stained by hematoxylin and eosin (H&E) or Masson trichrome. F fibrous tissue, B regenerated bone. Histological staining was conducted three times independently.