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. 2018 Jan 10;8:251. doi: 10.1038/s41598-017-18355-1

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© The Author(s) 2017

Open Access This 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 license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license 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 license, visit http://creativecommons.org/licenses/by/4.0/.

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Inter-species variability in hemolytic activity and nematocyst density. (a) Schematic phylogeny of the seven studied reef-building corals^77,78. The images are not shown to scale. (b) Hemolytic activity in tissue extracts of the seven corals, normalized to surface area. HU-Hemolytic Unit, defined as the amount of hemolytic activity causing 50% hemolysis of human red blood cells in a standard, 500 μl reaction (see materials and methods). (c) Nematocyst density in the tissue, normalized to surface area. Data in panels C and D are the mean ± SE of one fragment (branch tip) each from 5 different colonies.