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Effect of nerve growth factor (NGF)- microspheres on S-100 expression in the regenerated facial nerves at 90 days post-surgery (immunohistochemical staining, × 100).
In the NGF-microspheres group (A) and autologous nerve group (D), there was higher S-100 positive expression than in the NGF group (B) and normal saline group (C). Arrows indicate S-100 positive expression.
