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. 2019 Jan 28;18:17. doi: 10.1186/s12934-019-1066-4

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© The Author(s) 2019

Open AccessThis article is distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided 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 Creative Commons Public Domain Dedication waiver (http://creativecommons.org/publicdomain/zero/1.0/) applies to the data made available in this article, unless otherwise stated.

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Fig. 6 — Comparison of efficiency of different signal peptides. a SDS-PAGE analysis of different signal peptides in culture medium following incubation for 24 h. The molecular weight of mature rhFGF21 is about 27 kDa. Column M: molecular weight marker. Column Ev: plasmids of pMATE of strain 1A751C served as negative control. b The relative densitometric analysis for rhFGF21 secreted by different B. subtilis strains. c Western blotting analysis of the secreted rhFGF21 protein with different signal peptides in B. subtilis