Well, when we have low blood glucose levels, we're essentially going from this T state to this r state. So when we have very low concentration of glucose in the blood, these glucose molecules will essentially remove themselves. And once they remove themselves, a conformational change takes place that shifts the equilibrium toward the r state. And in the rstate the enzyme is fully active and it will bite to glycogen and begin breaking down glycogen into glucose and then the glucose will be removed into the blood plasma. Now remember, in skeleton muscle cells we have phosphorase A and phosphorace B. In liver cells we also have phosphorase A and phosphorase B.