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. 2019 Jul 5;18:120. doi: 10.1186/s12934-019-1166-1

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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. 1 — Heterologous crocetin and crocin biosynthesis pathways initiated from zeaxanthin. Crocin-1, crocin-2, crocin-3 or crocin-4 and crocin-5 were obtained in vitro, and only crocin-5 was obtained in E. coli cells

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