Fig. 6

Effects of NAG treatment on the weight and histological alteration of biceps. A Representative photographs of biceps muscles from both ipsilateral and contralateral regions of the avulsed rats. Scale bar represents 2 mm. B Average ratio of biceps muscles wet weight of the right (injury) to the left (intact) side at 8 weeks postoperatively. C Average ratio of biceps muscle volume of the right (injury) to the left (intact) side at 8 weeks postoperatively. D Histological images of longitudinal bicep muscle sections with H&E staining from all groups. Scale bar represents 100 μm. E Average ratio of the muscle fiber diameter of the right (injury) to the left (intact) side. F The extent of fibrosis was calculated as the ratio of the number of fibroblast nuclei in the right (injury) to the left (intact) side. Data shown are mean ± SD in each group; ***P < 0.001, **P < 0.01, *P < 0.05. NS normal saline, NAG acetylglutamine