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Expression of chondroitin sulfate proteoglycan (CSPG) in different groups. (A) TN + NS group, strong CSPG-positive expression was found in the area of transplantation of tibial nerve in host spinal cord; (B) TN + lithium chloride (LiCl) group; (C) TN + neural stem cell (NSC) + NS group; and (D) TN + NSC + LiCl group.
