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. 2017 Aug 2;7:7111. doi: 10.1038/s41598-017-07768-7

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© The Author(s) 2017

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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Role of endothelium in cholinergic vasodilatory responses of ophthalmic artery of eNOS−/− mice. Vasodilatory responses to ACh (10⁻⁴ M) were almost abolished in vessels denuded of endothelium. Conversely, vasodilation to exogenous NO donor, SNP (10⁻⁴ M) was preserved in both endothelium-denuded and -intact vessels. Values are expressed as mean ± standard error of the mean (s.e.m) (n = 6 per group; ***P < 0.001, endothelium-denuded versus endothelium-intact).