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. 2017 Feb 28;8:291. doi: 10.3389/fmicb.2017.00291

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Copyright © 2017 Alonso-Pernas, Arias-Cordero, Novoselov, Ebert, Rybak, Kaltenpoth, Westermann, Neugebauer and Boland.

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) or licensor 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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Structure of the hindgut pocket. (A) Pocket attached to the hindgut external surface (black arrowheads). (B) Autofluorescence image of the pocket tissue using a 488 nm laser in a confocal microscope. White arrowheads point to pocket poles. (C) Transmission Electron microscopy (TEM) image of a cross-section of a pocket pole. The yellow arrowheads point to the acellular layer, possibly mucous-like, enveloping every pole. (D) TEM image of the dense bacterial population in the center of the pocket poles. Black arrowheads point to the PHB granules observed in the bacterial cytoplasm. Scale bars: (A,B) 100 μm, (C,D) 1 μm.