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. 2018 Jul 10;10:30. doi: 10.1186/s13099-018-0257-6

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© The Author(s) 2018

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. 2 — Spectral change of Alr, DadX and SEN3897 alanine racemases caused by incubation with (a–c) l-alanine and (d–f) d-alanine. The UV–visible spectra (300–500 nm) was obtained at the indicated times. g Expression of alr, dadX and SEN3897 in vitro during their exponential and stationary growth phases through qRT-PCR analysis