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. 2017 Nov 1;37:22. doi: 10.1186/s41232-017-0053-6

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© The Author(s) 2017

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 — Microscopic view of the proliferation of PDs. PDs seeded on temperature-responsive culture inserts were observed on day 3 (a), day 5 (b), day 7 (c), and day 14 (d) (×100). Cells reached confluence at day 5 and, by day 14, they were tightly packed. (Scale bar = 100 μm)