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. 2020 Feb 7;10:2089. doi: 10.1038/s41598-020-59085-1

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© The Author(s) 2020

Open Access This 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 license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license 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 license, visit http://creativecommons.org/licenses/by/4.0/.

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Prostaglandin F2 alpha content. (a) Prostaglandin F2 alpha content during pregnancy. Hormone content was quantified by enzyme immunoassay. Symbols correspond to tissues from individual mares (Δ, allantochorion; ○, endometrium). Note the logarithmic scales in panels a and b. (b) Prostaglandin F2 alpha content in physiological parturition (PHYS) and parturition with fetal membrane retention (FMR). Horizontal lines indicate geometric means.