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. But this happens separate of the urea cycle. So once arginine is transformed into ornathene, the ornithine then acts as a substrate for the enzyme ornathene amino transfers phrase. And what that enzyme does is it transforms that ornithine into glutamate semiaaldehyde, and then the glutamate semi aldehyde is transformed into glutamate via this step here.