But again, we have a very important difference in skeleton muscle cells. We actually have an isozyme of pyruvate kinase known as M isozyme, where M you can think of stands for muscle, while inside our liver cells we have the L isozyme for the pyruvate kinase. So essentially, inside the liver cells, we have both l and misozymes. But it's the l isozyme in the liver cells that predominates. And so unlike the misozyme we find in muscle cells, the lizosign is actually controlled by another process and that process is for sporulation. So to see what we mean, let's take a look at the following diagram.