Now, by the way, I forgot to mention, if we go back to this citrate molecule here, notice that we color coded this molecule. And that's because this violet region basically comes from this section here, and this second oxygen comes from this water molecule shown in blue. Now, I color coded this orange because this is the molecule that is ultimately being transferred onto this carbon here. So the only difference between citrate and isocytrate is the position of this hydroxyl group. It is moved from this location onto this location here. Now, once we form the isocytrate, which, by the way, is actually an endergonic reaction, we essentially use up about 6.3 kilojoules per mole of energy.