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. 2018 Aug 3;8:11666. doi: 10.1038/s41598-018-30094-5

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© The Author(s) 2018

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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Phenylephrine-induced relaxation was less pronounced in pregnant mouse uterine rings. (a,b) A sample isometric tension trace and summary data are shown. Phenylephrine (PE) relaxed pregnant mouse uterine rings stimulated with oxytocin in a concentration-dependent manner (N = 5). (c,d) A sample trace and summary data show the caffeine-mediated inhibition of pregnant uterine ring contractions induced by oxytocin (N = 4). *p < 0.05, **p < 0.01, ***p < 0.001. The data were presented as means ± S.E. The value of “N” is the number of mice.