So once the NADH is actually formed within the matrix of the mitochondria, it goes on to complex one of the electron transport chain. And this is in contrast to the previous shuttle system that we discussed, the glycerol phosphate shuttle system, in which the NADH actually ends up the electrons on the NADH end up being transferred onto complex three. So here the NADH is basically we take the NADH that we form in the matrix and we essentially oxidize it into NAD plus. In this process, as electrons move along the groups within complex one, a net result of four ATP molecules are actually transported into the matrix into the intermembrane space of the mitochondria. Now, those electrons eventually end up on quinone. The quinone becomes the Ubiquinone, the Ubiquinone becomes the Ubiquinol, and the Ubiquinol travels onto complex three.