Now it's the cyclic Amp that acts as a secondary messenger. It goes on and binds onto regulatory sites of protein kinase A and that activates it by allowing the catalytic sites or the catalytic units to actually dissociate from that regulatory site from that regulatory subunits. And so that activates protein kinase A. And protein kinase A actually does two important things. Number one is it creates a pathway that activates glycogen breakdown and it also creates a pathway that essentially deactivates glycogen synthesis. So let's begin by focusing on this pathway here.