And what happens next is we essentially cleave this high energy bond that releases a certain amount of energy, and the energy that is released is used to basically drive this reaction here the addition of the orthophosphate onto the GDP to form the GTP. In the process, we release the coenzyme a. Now, by the way, step four releases negative 30.1 kilojoules per mole of energy, while step five releases negative 3.3 kilojoules per mole of energy. And we also produce the GTP. So step five is the only step of the citric acid cycle that actually generates this high energy purine nucleuside triphosphate molecule, the GTP. Now, the GTP can either be transformed into ATP or it can actually be used by, for instance, a g protein to carry out some type of specific process in the cell, for instance, a signal transduction pathway.