And as a result, it's no surprise that the way that our liver cells regulate the process of glycolysis is more complex than the way that our skeleton muscle cells regulate the process of glycolysis. So in our discussion, we're going to focus on liver cells and how liver cells regulate the process of glycolysis. And although we'll see many similarities between skeletal muscle cells and liver cells, we'll see that liver cells use a slightly more complex regulatory pathway. Let's begin with phosphorptokinase. So once again, phosphorptokinase is the most important regulatory enzyme. And what it does is it regulates that commitment step.