It stimulates the adenalyt cyclist to begin transforming the ATP into the cyclic Amp. These cyclic Amp molecules are what we call secondary messenger molecules. And that's because these secondary messenger molecules are intramolecular molecules found inside the cells that can diffuse into different regions and organelles found within that cell. And they can basically induce and stimulate many different types of processes as we'll see in just a moment. Now, this is the second level of Amplification. So this was the first and this is the second.