So in step number two, we see that the enzyme transfers the two electrons and two protons from the g three P onto Fad to form the Fadh two. And in the final step of the glycerol 35 state shuttle, the Fadh two is actually oxidized back into Fad. In the process, those two electrons and the two protons that ultimately came from these two reactants here are basically transferred onto a Ubiquinone that is found within the hydrophobic core of the inner membrane of the mitochondria. And we reduced that ubiquinone into ubiquinol. Now, remember, back in our discussion on electron transport chain, we said that Ubiquinol basically carries the high energy electrons and the protons onto complex three of the electron transport chain. So if this is our electron transport chain, we have complex one, complex two, complex three, four, and complex five.