So this is what it looks like. So we have the membrane, we have the outside, the inside. This is the epinephrine shown in red. And instead of drawing out this complex structure, we're going to represent this complex structure with this green structure here. So this is the seven TM domain, and this pocket is the pocket shown here to which the epinephrine actually binds to. Now let's take a look at the structure of the beta adrenergic receptor.