Now, by the way, as these electrons are basically moved from the cytochrome seed to these two final groups. And as we ultimately form the two water molecules, a total of four protons for hydrogen ions are essentially pumped from the matrix of the mitochondria to the intermembrane space. And this is shown in the following diagram. So this is basically the summary of these four steps. So once again, in the final step, in step four, the abstraction of two more hydrogen ions to a protons from the matrix helps oxidize the heme A three and the copper B group back to their original oxidized states. In the case of copper B, we basically oxidize it back into the copper two plus form.