And the short chain one acts on fatty acids that contain four or six carbon atoms. So, as we discussed in this particular section, once the two electrons are transferred onto Fadh two, which is actually a prosthetic group found on this enzyme, the two electrons are then moved onto ETF, then onto an enzyme we call ETF dehydrogenase. And then finally, they are used to actually reduce Ubiquinone into Ubiquinol. And the Ubiquinol carries those two electrons onto the second proton pump found along the electron transport chain. And so we see that the Fadh two that is produced in this oxidation step basically generates 1.5 ATP molecules along the protons, along the proteins of the electron transport chain, etc. Now let's move on to step two.