So we saw that the carboxylation process is actually an endergonic process. Now, that implies if carboxylation requires energy, that means decarboxylation actually releases energy. And that's important in this step because what happens in this step is this oxalo acetate is transformed into phosphorinopyruvate. And in the process, there are two different things that take place. Number one is we essentially undergo the process of decarboxylation where this CO2 group is actually released. And number two, we also phosphorylate this oxyloacetate into this molecule.