And those NAD pluses are not actually regenerated at the end of glycolysis. And because our cells have a limited supply of the NAD plus molecules, and by the way, the NAD plus molecules actually are derivatives of niacin, which is vitamin B three. And so because our cells have a limited supply of the NAD plus, this process of glycolysis will eventually come to a stop when that cell runs out of that limited supply of nicotine amyde adenine Dinucleotide. And so for this not to actually take place, something else must be done after glycolysis takes place. So something must be done to regenerate that coenzyme the NAD plus that is necessary for the activity of gap dehydrogenase that basically catalyzes step six of glycolysis. So once again, in step six of glycolysis, NAD plus nicotine amide adenine dinucleotide in the oxidized form, this is the molecule that comes from niacin, vitamin B three.