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. 2019 Mar 21;9:5215. doi: 10.1038/s41598-018-36847-6

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© The Author(s) 2019

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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IETDase protease activity stimulated in Emiliania huxleyi infected with Phaeobacter inhibens. In vitro IETDase (Ile-Glu-Thr-Asp) activity in E. huxleyi control and co-cultures was measured using Caspase-8 Activity Kit. The ratio of IETD cleavage in E. huxleyi cells infected with the bacterial pathogen was normalized to IETD cleavage activity in uninfected control cells to depict relative increase in algal caspase-like enzymes capable of IETDase cleavage. Error bars (±SE) were calculated using the error-propagation equation.