So the takeaway lesson from this lecture is the fact that glycolysis by itself is not a perfect process. And if it's left alone, then it will eventually end because it will run out of that supply of the coenzyme NAD plus. And so to regenerate that NAD plus and to make sure that the NAD plus is continually used and glycolysis is continually taking place in producing ATP molecules in our cells, we have to metabolize the Pyruvate under aerobic conditions. That's when the citric acid takes a citric acid cycle takes place. Under anaerobic conditions, we have lactate fermentation or lactic acid fermentation, ethanol, fermentations, and also many other examples of fermentation processes that we're not going to discuss in this lecture. So in the next lecture, we're basically going to discuss how glucose molecules are not the only molecules that can undergo glycolysis.