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. 2021 Jan 21;11:1955. doi: 10.1038/s41598-021-81371-9

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© The Author(s) 2021

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 licence, and indicate if changes were made. The images or other third party material in this article are included in the article's Creative Commons licence, unless indicated otherwise in a credit line to the material. If material is not included in the article's Creative Commons licence 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 licence, visit http://creativecommons.org/licenses/by/4.0/.

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Rostrocaudal extent and location of the lumbosacral enlargement in various species. The typical segmental levels of the lumbosacral enlargement were: L3-S1 for rats, L4-S1 for cats, L3-S1 for pigs, L2/L3-L7/S1 for rhesus macaque, and T12/L1-S1/S2 for humans. Levels for enlargement (in brackets) are spinal cord segments; the levels on the right side of the spinal column indicate the vertebral levels. Boxes represent interquartile range; horizontal line shows the median; whiskers represent minimum and maximum values of the dataset. ‘*’ symbol represents p < 0.05. Solid dots show individual data points.