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. 2021 Feb 17;12:141. doi: 10.1186/s13287-021-02192-1

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© The Author(s) 2021

Open AccessThis article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons licence, and indicate if changes were made. The images or other third party material in this article are included in the article's Creative Commons licence, unless indicated otherwise in a credit line to the material. If material is not included in the article's Creative Commons licence and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this licence, visit http://creativecommons.org/licenses/by/4.0/. 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 in a credit line to the data.

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Fig. 2 — The effect of conditioned medium derived from different placental cells or sub-cultured placental tissues on the proliferation of HUVECs. a The growth curve on HUVECs culturing with early-CTBs-CM obtained at different time points. b The growth curve on HUVECs culturing with early-hPDMSCs-CM obtained at different time points. c The growth curve on HUVECs culturing with middle-hPDMSCs-CM obtained at different time points. d The growth curve on HUVECs culturing with term-hPDMSCs-CM obtained at different time points. e The graph of the HUVECs number on the 6th day of proliferation assay with different placental cells CM obtained at 24 h. f The growth curve on HUVECs culturing with sub-cultured placental tissue-CM obtained at different time points. *p < 0.05 and **p < 0.01 vs control. ^δp < 0.05 and ^δδp < 0.01 vs another group within the group