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. 2017 Dec 20;7:17881. doi: 10.1038/s41598-017-18169-1

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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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Peptide aptamer characterization. (a) The sequence and predicted structure of the selected peptide aptamer; and (b) SPR analysis for the affinity binding of the peptide aptamer to Cathepsin E using single-cycle mode with an aptamer level of 1000 RU and sequential injections of five ascending concentrations of analyte Cathepsin E (858.37, 171.67, 34.33, 6.87, 1.37 ng/mL). The data for the steady-state affinity binding plot were calculated from the end of the association phases against the analyte concentration.