And that's the first way by which our body can shut off this process. The second way is to actually turn off this green molecule, the Ras protein. So just like in the case of our insulin not insulin, the Epinephrine signaling pathway where Epinephrine basically used what that pathway used? G proteins. And the G proteins have the ability to turn off their own activity. In this case, this small G protein, the Ras, also contains Gtpa's activity.