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. 2018 May 9;8:7414. doi: 10.1038/s41598-018-25784-z

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© The Author(s) 2018

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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Proteinase K digestion kinetics of H1 histones in absence and presence of 10 μM CuCl₂ analized by AU-PAGE. (a) Native sperm H1 histones digested for 30′-3 h and overnight; (b) Somatic H1 histones digested for 30′-3 h and overnight; (c) Deguanidinated sperm H1 histones digested for 5′–30′; (d) Native sperm H1 histones digested for 30′ in absence and presence of 10 μM NiCl₂.