And we'll talk about those in a later lecture. But basically, the tetrahydrofolate acts to basically take off this entire group. So the carbon along with this nitrogen, so this nitrogen gains two more H ions. We basically form our glutamate and this THF, the tetrahydropholate abstracts this, forming this molecule here. So once the histidine is transformed into glutamate, then we simply undergo this step that is catalyzed by glutamate dehydrogenase to form the alpha ketoglutrates. So that's five.