Well, basically the epinephrine receptor complex actually is used to stimulate the transformation of the GDP alphagin form into the GTP alphagin form. And the question is, how can the cells inactivate the epinephriceptor complex and prevent any further activation of the alpha G proteins? So there are two different ways. Let's begin by discussing this pathway here. So one very simple way to actually deactivate this particular structure is for the epinephrine to actually be released, for the epinephrine to simply dissociate. So if the epinephrine dissociates from that site, as shown in this diagram, what that does is it basically inactivates the ability of this beta receptor to basically activate the alphagy proteins.