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. 2018 Mar 14;18:14. doi: 10.1186/s12896-018-0426-1

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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 — Immunofluorescence staining for collagen type II (a1-f3), collagen type I (g1-l3) (green), F-actin (a-l) (red), and nuclei (blue) in human chondrocytes at passage 0–2 on G5 and PS surfaces. Panels a2-l2 show the enlargments of white box areas in panels a1-l1, respectively. Scale bars show 100 μm