And then it can basically pass those electrons onto the iron sulfur component of the enzyme, which passes along the remaining proteins of the electron transport chain. So this step is very important because it's essentially the link between the citric acid cycle and that oxidative phosphorylation process that takes place on the electron transport chain. Oh, and one other thing that I'd like to mention about the formation of the GTP, just like in Glycolysis, where we had substrate level phosphorylation, this is also an example of substrate level phosphorylation, where a substrate molecule is used by enzyme to generate a high energy GTP molecule. And that's in contrast to oxidative phosphorylation that takes place on the proteins of the electron transport chain. So let's finish off with step seven and step eight. So we have an oxidation reduction reaction in step six.