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. 2019 Dec 4;10:373. doi: 10.1186/s13287-019-1486-4

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© The Author(s). 2019

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. 8 — Intrinsic beat rate characteristics. a Spontaneous beat rate of hECTs on days 6, 8, and 10 after tissue fabrication. b Beat rate variability (measured as coefficient of variation, COV), at the same three time points. Dot plots show individual data with bars representing mean ± SD; n = 13, 11, 10 for hCM-only control hECT (red circle) and n = 14, 14, 13 for hCSC-supplemented hECT (blue triangle) on days 6, 8, and 10, respectively