Main Reaction: 2 H+ + Fd(reduced) >> Fd(oxidized)

Reference: PubMed ID: 18779592
Authors: Shaw AJ, Podkaminer KK, Desai SG, Bardsley JS, Rogers SR, Thorne PG, Hogsett DA, Lynd LR
Title: Metabolic engineering of a thermophilic bacterium to produce ethanol at high yield.
Published: 2008 Sep 16

2 H + Fd(reduced) --> Fd(oxidized)