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. 2015 Jul 11;42(9):1263–1272. doi: 10.1007/s10295-015-1644-3

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© The Author(s) 2015

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.

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Fig. 1 — Fermentation pathways in C. thermocellum. Fd ferredoxin; LDH lactate dehydrogenase; PFOR pyruvate: Fd oxidoreductase; PFL pyruvate: formate lyase; PTA/ACK phosphotransacetylase/acetate kinase; AldH/ADH aldehyde dehydrogenase/alcohol dehydrogenase; H ₂ ases hydrogenases including ech-type Fd-dependent hydrogenase and bifurcating hydrogenases. Oxidoreductases include NADH dependent reduced ferredoxin: NADP⁺ oxidoreductase (NfnAB) and NADH:Fd oxidoreductase (RNF)