And once it binds onto our adenylene cyclase it causes the conversion of ATP adenosine triphosphate to cyclic adenosine monophosphate or CA MP. And then this is our secondary messenger. So our epinephrine is the primary or first messenger involved in the signal transduction process and this is the second molecule involved. And so this is called our secondary messenger. And the secondary messenger, our cyclic Amp goes on and activates protein kinase A. So that now protein kinase A can go on and phosphorylate other enzymes inside our cell.