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. 2021 Jan 29;11:591310. doi: 10.3389/fphar.2020.591310

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Copyright © 2021 Yu, Liu, Zhang, Cheng, Zhou, Zuo, Kang, Wei and Ma.

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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Transverse section was processed by different microscopes and software: (A) ZEISS and ZEN, (B) OLYMPUS and photoshop (showing the pixel of xylem and pith), and (C) OLYMPUS and photoshop (showing the pixel of pith).