And once the GTP binds onto that g protein and activates the protein and the protein then travels and binds onto another membrane molecule known as adenylate cyclist. And what this enzyme basically does is, upon the binding, it is activated. Upon the binding of the g protein, it is activated, and it begins the conversion of ATP molecules into cyclic Amp molecules. And the cyclic Amp is a secondary messenger in this particular cyclical transduction pathway. Now, the cyclic Amp molecules then move on to target protein. So PKA molecules protein kinase A.