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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. 3 — Analysis of dark dots on hiPSC-derived cartilaginous particles. Histological analysis of a hiPSC-derived cartilaginous particle with dark dots at 12 weeks. a Sections were bleached and counterstained with kernechtrot. b Sections were initially bleached weakly and subjected to PAS staining, Giemsa staining, and Schmorl’s reaction. Bars, 50 μm. Boxed regions are magnified in the images below.