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. 2016 Sep 9;6:33168. doi: 10.1038/srep33168

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Copyright © 2016, The Author(s)

This work is licensed under a Creative Commons Attribution 4.0 International License. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in the credit line; if the material is not included under the Creative Commons license, users will need to obtain permission from the license holder to reproduce the material. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/

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(a–d) Light microscopy images from enclosed crypt; a large number of bacteria as observed in the crypts. L: lumen. (e) TEM of a crypt containing symbiotic bacteria. (f) TEM of a single symbiotic bacterium in the crypt.