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. 2022 Jan 11;12:796704. doi: 10.3389/fneur.2021.796704

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Copyright © 2022 Xu, Wang, Ding, Wang and Zhu.

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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Activation of microglia in spinal cord injury (SCI). Resting microglia are activated into several phenotypes by various stimuli. Pink arrow, upregulation; blue arrow, downregulation.