And we'll see what those are used for in just a moment. So this is what the insulin receptor actually looks like. Now, notice there's an important difference between this insulin receptor and the receptors that we spoke of previously. So, for instance, in our discussion on the epinephrine signaling pathway we said that that pathway actually uses G proteins and those receptors are known as G coupled protein receptors. But in this particular case, for the case of insulin we don't actually use any G proteins. Instead, we actually have protein kinases found within the structure of this receptor.