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. 2021 Aug 26;15:730348. doi: 10.3389/fncel.2021.730348

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Copyright © 2021 Cao, Shi, Xiao, Chen, Chen, Yang, Shu, Yin, Wu, Yin, Fu, Tan, Zhou, Wu, Jiang and Dai.

This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner(s) are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.

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No ipsilesional CST axons regeneration across the lesion site. (A) Transverse sections of hemisection model rats show the bilateral CSTs are mainly located in the deep dorsal funiculus. (B) The representative longitudinal sections contiguous to those with the maximum diameter show that the contralesional rostral CST axons descend through the hemisection injury site and arrive at the caudal segment. However, the ipsilesional CST fibers were terminated in the hemisection injury site, indicating no CST axonal regeneration. (C) The sketch map shows the CST regeneration contributing to the spontaneous locomotor recovery; however, this probability is also excluded in the hemisection model rats. n = 8 for CST tracing in hemisection model rats. Scale bar, 50 μm. CST indicates the corticospinal tract.