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. 2019 May 28;18:95. doi: 10.1186/s12934-019-1138-5

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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. 2 — Fermentation product identification for strain Y1-8; a GC–MS analysis of (1) squalene, (2) ergosterol, (3) lanosterol, (4) β-amyrin standards; b GC–MS analysis of cell extraction of control strain Cen.pk 2-1D; c GC–MS analysis of cell extraction of constructed strain Y1-8; d mass spectra of β-amyrin standard; e mass spectra of β-amyrin produced from strain Y1-8