So, once that Epinephrine signal transduction pathway actually carries out its ultimate goal of producing that specific type of physiological response due to some type of stimulus, how is it that the cells can actually shut down this pathway? What methods can they actually use to shut down this Epinephrine signal pathway? Well, basically, there are two points in the Epinephrine pathway that the cell can actually use and shut down that pathway. So we have point A and point B. And let's begin our discussion by focusing on point A. So in point A, we basically have that alpha G protein adenylit cyclist complex.