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. 2016 Dec 19;7:2041731416683950. doi: 10.1177/2041731416683950

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© The Author(s) 2016

This article is distributed under the terms of the Creative Commons Attribution-NonCommercial 3.0 License (http://www.creativecommons.org/licenses/by-nc/3.0/) which permits non-commercial use, reproduction and distribution of the work without further permission provided the original work is attributed as specified on the SAGE and Open Access page(https://us.sagepub.com/en-us/nam/open-access-at-sage).

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Figure 1. — Types of epithelium corresponding to distinct physiological systems.

Diagram template adapted from Wiki Commons²⁰ and SEM pictures from Science Photo Library.²¹