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. 2019 Mar 8;10:204. doi: 10.3389/fphys.2019.00204

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Copyright © 2019 Bonelli, Bruno, Caccia, Sgambetterra, Cappellozza, Jucker, Tettamanti and Casartelli.

This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner(s) are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.

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Morphological organization of the AMG. (A) cross-section of AMG. (B) Wide basal infolding (arrows) in columnar cells. (C) Rough endoplasmic reticulum (rer) in the cytoplasm of columnar cells. (D) Electron-dense vesicles (v) in the apical part of columnar cells, under the microvilli (mv). e: epithelium; l: lumen; m: mitochondria. Bars: 100 μm (A), 2 μm (B), 1 μm (C,D).