atoms from a reactant (R), in the form of a hydride ion (H^-), and a proton (H). The proton is released into solution, while the reductant RH is oxidized and NAD reduced to NADH by transfer of the hydride to the nicotinamide ring.

:RH + NAD -> NADH + H + R;

From the electron pair of the hydride ion, one electron is attracted to the slightly more electronegative atom of the nicotinamide ring of NAD, becoming part of the nicotinamide moiety. The remaining

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