And that's because the urea cycle does not take place inside the muscle. And so our body actually has two ways by which it can get rid of this ammonium from our skeletal muscle. But ultimately, what the skeleton muscle cell must do is it must be able to transport that ammonium back to the liver, where that ammonium can be fed into the urea cycle. And one of these pathways is known as the glucose alanine cycle. And this will be the focus of this lecture. So let's suppose we are fasting.