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. 2018 Oct 4;38:17. doi: 10.1186/s41232-018-0075-8

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© The Author(s) 2018

Open AccessThis article is distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided 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 Creative Commons Public Domain Dedication waiver (http://creativecommons.org/publicdomain/zero/1.0/) applies to the data made available in this article, unless otherwise stated.

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Fig. 2 — Aberrant emergence of dark dots on the surface of hiPSC-derived cartilaginous particles. a Image of a hiPSC-derived cartilaginous particle with dark dots at 12 weeks. b Histological analysis of the hiPSC-derived cartilaginous particle in a. Semiserial sections were stained with hematoxylin-eosin and safranin O-fast green-iron hematoxylin. Arrows indicate dark dots. Bars, 50 μm.