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. 2015 Jun 20;8:89. doi: 10.1186/s13068-015-0272-5

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© Chen et al. 2015

This is an Open Access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/4.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly credited. 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 — The effects of CO and H₂ mass transfer and cellular uptake on biomass production and the distribution of metabolic products by C. ljungdahlii. The lines with arrows represent positive/activating effects and the lines with bars represent negative/inhibitory effects