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. 2017 Apr 27;8:7. doi: 10.1186/s13227-017-0070-1

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© The Author(s) 2017

Open AccessThis article is distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided 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 Creative Commons Public Domain Dedication waiver (http://creativecommons.org/publicdomain/zero/1.0/) applies to the data made available in this article, unless otherwise stated.

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Fig. 2 — Cnidarians provide unique research opportunities. a Following formation of an aggregate from a suspension of Hydra cells, endodermal (red DsRed2) and ectodermal (green GFP) epithelial cells separate into distinct tissue layers. Left T = 0 h. Right T = 4 h (courtesy of O. Cochet-Escartin; scale bar 200 µm). b Aiptasia with Symbiodinium symbionts. Left polyp (blue, Hoechst staining); symbionts (red). Right magnified view of the boxed region in the left image (courtesy of T. Tivey; scale bar 15 µm)