But the glycogen phosphorase inside liver cells is slightly different than the phosphorase that we find inside skeletal muscle cells. So essentially, the liver phosphorase is an isozyme version of the muscle phosphorase. They're pretty much the same molecule with some minor differences. And one important minor difference between liver phosphorylase and muscle phosphorase is that liver phosphorylase is actually sensitive to glucose molecules. Glucose is an allosteric effector. More specifically, it's an allosteric inhibitor of phosphorase.