>>Does anyone know of analogs or other molecules that serve the same
>function as electron acceptors/donors such as NAD/NADH, whether natural
>or synthetic?
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'electron acceptors/donors' is vague---doesn't that include inorganic
batteries, as well as the electron transfer systems involved with
photosynthesis and oxidative phosphorylation?
In metabolic pathways assosciated with NAD/NADH there are also FAD/FADH2 and
NADP/NADPH.