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. 2022 Aug 11;9:989627. doi: 10.3389/fmolb.2022.989627

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Copyright © 2022 Cheng, Yang, Hai and Zhou.

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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Co-citation timeline of references by keywords on oxidative stress in intervertebral disc degeneration. (The nodes represent the references. The larger the node, the more citations the reference. The colors of the nodes from the inside to the outside correspond to color scale, which represents the total co-citations for the reference in the specific year. The line between two nodes represents two references co-citations. The thicker the line, the more the co-citations. The color of the connection line corresponds to the color mark above, which can reflect the time when two references were first co-cited.)