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. 2019 Feb 22;9:2621. doi: 10.1038/s41598-019-39191-5

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© The Author(s) 2019

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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FITC-insulin can be detected with an anti-insulin antibody and shows widespread association with blood vessels in the cortex of rats after IN administration (A). Little staining is observed in rats administered IN saline (B). FITC-insulin is observed in the perivascular space (C) of cortical blood vessels (D) 30 min after intranasal administration. Merged image + DAPI is shown in (E). Scale bar = 100 μm for (A,B); 20 μmm for (C–E).