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Light microscopy images of transverse sections of the sciatic nerve 2 mm distal to the conduit (stained by osmium tetroxide, ×400): Chitin conduit small gap tubulization at 3 months. (A: Saline; B: NGF solution; C: Saline containing blank microspheres; D: Saline containing NGF-loaded microspheres) and 1 year (E: Saline; F: NGF solution; G: Saline containing blank microspheres; H: Saline containing NGF-loaded microspheres).
