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. 2018 Mar 14;8:4485. doi: 10.1038/s41598-018-22792-x

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© The Author(s) 2018

Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/.

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Correlation of gray and white matter volumes in right premotor areas. Positive correlation between the gray matter volume in the right dorsal premotor cortex (PMd) and the white matter volume in the right radiation of corpus callosum (RCC) across the nerve-injured participants. The solid line shows the orthogonal linear regression line; participants with left (red) and right (blue) sided injury pooled. No corresponding correlation was present for the control participants (black open circles, r = 0.23, t₁₄ = 0.90, P = 0.37). Inlay of slice image from Fig. 3a. (Y = 2) to illustrate anatomical proximity of gray matter effect in the right PMd and white matter effect in RCC. n.u., normalized units (see Methods).