So let's focus on the phosphorylation for just a moment. So we have PKA, which is activated by the binding of cyclic Amp, goes on and activates phosphorylase kinase. And what phosphorase kinase does is it goes on and activates Glycogen phosphorase. Now, Glycogen phosphorase is that enzyme that initiates step one of Glycogen breakdown. So ultimately, we see that the signal, the primary messenger molecule that initiates Glycogen breakdown in the liver cells is in fact leukagon. Now, what about epinephrine?