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. 2021 Mar 31;11:7236. doi: 10.1038/s41598-021-86740-y

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© The Author(s) 2021

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 licence, and indicate if changes were made. The images or other third party material in this article are included in the article's Creative Commons licence, unless indicated otherwise in a credit line to the material. If material is not included in the article's Creative Commons licence 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 licence, visit http://creativecommons.org/licenses/by/4.0/.

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Effect of different proteases (papain [black bars], trypsin [grey bars], chymotrypsin [dashed gray bars] and pig pancreatic elastase [PPE, squared black bars]) on the serpin production levels in bifidobacteria harboring the serpin encoding gene, after 16 h of growth. The studied strains are B. longum subsp. longum NCC 2705, B. longum subsp longum ATCC 15707 (type strain [T]), B. longum subsp. infantis ATCC 15697 (T), B. longum subsp. suis ATCC 27533 (T) and B. breve ATCC 15700 (T). Serpin levels are expressed relative to the control level (including standard deviations) measured in MRS without addition of proteases. Statistical difference relative to the control cells are indicated; ****p < 0.0001.