Non-NAD+ oxidizing agent/electron acceptor employed most notably in the Krebs cycle.
Flavin adenine dinucleotide, or FAD, accepts two electrons, forming FADH2, during the succinate → fumarate step of the Krebs cycle.
The basic reaction driven forward by FAD acceptance of electrons looks like this:
2H-C-C-H2 + FAD → H-C=C-H + FADH2.
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