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. 2018 Mar 2;16:17. doi: 10.1186/s12958-018-0333-2

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© The Author(s). 2018

Open Access This 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. 5 — Primary human first-trimester trophoblast cultures spontaneously secreted CXCL12 in vitro. Spontaneous CXCL12 secretion in supernatants of in vitro cultured TCs measured at 24, 48 and 72 h in culture.(n = 3)