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. 2021 Mar 11;11:5677. doi: 10.1038/s41598-021-83978-4

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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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Cross section of microscopic samples from Con Co Ngua. (a) Femora sections from CCN13M40a. There is increased cortical thickness, and the cortical width of right femur is asymmetrically wider than the left. (b) Upper limb sections from CCN13M40a. Large endocortical pores are evident. Medullary canal widening is most distinct on the humerus. (c) Upper and lower limb sections from CCN13M67a. While the femur presents with extreme cortical thickness and restriction of the medullary canal area, the upper limb sections present with severe porosity of the endocortical surfaces. (d) Asymmetry of the medullary canals of the humeri and femora of CCN13M67a.