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. 2020 Oct 2;8:144. doi: 10.1186/s40168-020-00919-5

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© The Author(s) 2020

Open AccessThis article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons licence, and indicate if changes were made. The images or other third party material in this article are included in the article's Creative Commons licence, unless indicated otherwise in a credit line to the material. If material is not included in the article's Creative Commons licence and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this licence, visit http://creativecommons.org/licenses/by/4.0/. 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 in a credit line to the data.

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Fig. 4 — Transmission electron micrographs depicting representative viral like particles (VLPs) associated with coral reef sponges. Representative tailed VLPs in Stylissa carteri (a, c) and Amphimedon ochracea (b); non-tailed icosahedral VLPs in Pipestela candelabra (d) and Cinachyrella schulzei (e); filamentous VLP from Cinachyrella schulzei (f); Geminate VLPs from Amphimedon ochracea (g); lemon-shaped VLP from Carteriospongia foliascens (h) and brick-shaped VLP from Crella cyathophora (i); using the TEM preparation methods: sponge sections (i) CsCl gradient separation (d, g) and from surface mucus (a-c, e-f, h). Scale bar = 100 nm. Arrow in Fig. 4a denotes the presence of a capsid tail structure