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. 2020 Jun 3;11:1147. doi: 10.3389/fmicb.2020.01147

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Copyright © 2020 Ehmann, Koeninger, Wendler, Malek, Stange, Wehkamp and Jensen.

This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner(s) are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.

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Reduction as well as proteolysis of HNP-4₁_–₁₁ and HNP-4₁_–₁₁_mod have no influence on the antimicrobial activity. (A) Changes in the antimicrobial activity against E. coli ATCC25923 were analyzed in the presence of a protease inhibitor cocktail. (B) The minimal inhibitory concentration of HNP-4₁_–₁₁ and HNP-4₁_–₁₁_mod was determined against E. coli ATCC25922 under reducing conditions due to the optical density after 12 h. Results from three independent experiments with ±SEM are represented. (C) ESI-MS analysis of HNP-4₁_–₁₁ to detect potential dimer’s after peptide dilution. (D) Analysis of HNP-4₁_–₁₁_mod using ESI-MS to detect potential dimer’s after peptide dilution.