Well, the final product form of this process is Ammonium. And Ammonium is a very toxic substance. And so if Ammonium was readily formed in the styroplasm, that can actually damage the cell. And so to prevent that from actually happening, our cell sequesters the glutamate dehydrogenase in the mitochondria and it basically keeps that Ammonium inside the mitochondria, preventing it from actually damaging the cell. Another important thing about this reaction is the same thing we mentioned here. These arrows go both ways.