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Masson staining of collagen fibers (× 100).
Arrows indicate a nerve growth cone in the MMSRM group (A), the epineurium in the MMSRM group (B), a nerve growth cone in the methylprednisolone group (C), and the epineurium in the methylprednisolone group (D). MMSRM: Methylprednisolone microsphere sustained-release membrane.
