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. 2016 Jun 29;16:148. doi: 10.1186/s12870-016-0840-2

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© The Author(s). 2016

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 — HPLC analysis of carotenoids in α-carotene and β-carotene-accumulating E. coli BL21 (DE3) cells transformed with pRSF-2 Ek/LIC-CitHYb (b), pRSF-2 Ek/LIC-CitCYP97A (c), pRSF-2 Ek/LIC-CitCYP97B (d), and pRSF-2 Ek/LIC-CitCYP97C (e). Carotenoids extracted from the suspension cultures of α-carotene and β-carotene-accumulating E. coli BL21 (DE3) cells with pRSF-2 (empty vector) were used as control (a). β-Car, β-carotene; β-Cry, β-cryptoxanthin; Zea, zeaxanthin; Zein, zeinoxanthin