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. 2020 Jul 13;10:11497. doi: 10.1038/s41598-020-68316-4

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© The Author(s) 2020

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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Inactivation of serpin-3∆N by Ac-SVAFS-NH₂ and Ac-SVAFS-COO⁻ over the time. Pre-dried Ac-SVAFS-NH₂ and Ac-SVAFS-COO⁻ (400 nmol) were incubated with purified serpin-3∆N (720 ng) at 37 °C for 2 h. A portion of sample was withdrawn at the indicated time intervals and added PAP3 to react at room temperature for 10 min, followed by IEARase activity measurement in 0.1 M Tris, 0.1 M NaCl, 5 mM CaCl₂, pH 8.0. Percentage of IEARase activity is defined as individual IEARase activity over gross PAP3 activity.