And this is catalyzed by the cytoplasmic glycerol three phosphate dehydrogenase enzyme. Now, once the g three P actually moves into the intermembrane space of the mitochondria, it is now oxidized back into DHAP by an enzyme that is found on the outer portion of the inner membrane of the mitochondria. And this enzyme, shown here in orange, is actually an isozyme version of this cytoplasmic glycerol three phosphate dehydrogenous enzyme. And so we call this enzyme the mitochondrial version glycerol three phosphate dehydrogenase, or simply the mitochondrial glycerol three phosphate dehydrogenase. Now, what this enzyme actually does is it oxidizes the g three P into DHAP by taking off those two electrons and two protons and placing them onto an Fad molecule that is bound to that enzyme. So Fad is flavin adenine dinucleotide, and it can accept two protons and two electrons.