And what that basically means is sometime after this process actually turns on the G protein, the G protein itself has the ability to hydrolyze the GTP back into GDP. And what that does is it turns off the G protein, the G protein returns back to this location here. And once the G protein dissociates from adenylate cyclist, that turns off the catalytic activity of adenylate cyclase and that stops transforming ATP into camp. So number One or A hormones are no longer released and B, G proteins have an intrinsic GCPA activity which allows them to basically turn themselves off. Now, what also happens is in the cytoplasm we basically have these proteins known as phosphodiestases. And these phosphodiaesterases, what they do is they begin to basically transform the CA and P cyclic adenosine monophosphate molecules into Amp.