Now, in the final step, we have an oxidation reduction reaction in which we essentially remove this H, attach an oxygen to form our glutamate. So once we form the glutamate. Again, the glutamate is then transformed into alpha keysagutrate. Now, I didn't show the mechanism on the board, but let's briefly talk about the mechanism by which arginine is transformed into glutamate. So arginine is initially transformed into ornithine by the enzyme arginase. And this is independent of the urea cycle because remember, in the urea cycle we also transform arginine into ornithine by the activity of arginase.