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. 2021 Aug 19;4:991. doi: 10.1038/s42003-021-02516-0

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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 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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Fig. 5 — Growth phenotypes of the punR and punC knockout strains in M9 medium with 0.2% glucose as the sole carbon source and a 2.5 mM adenosine as the sole nitrogen source, b NH₄Cl as the nitrogen source. The growth of the punR (O) and punC (X) deletion strains compared to the wild-type E. coli BW25113 (Δ) strain. c Growth of E. coli MG1655 wild-type (Δ) and punR (O) deletion strain in the same medium as in (a).