And the signal transduction pathway is actually very complicated, very complex and very extensive. And so what I'd like to focus on in this lecture is actually a small section of this insulin signal transduction pathway that stimulates the absorption of the glucose by the cells and a subsequent transformation of the glucose into the glycogen form. So this is what I'd like to focus on in this lecture. So let's see exactly how that takes place. Now, let's begin by focusing on the structure of the receptor that actually binds insulin. So insulin binds onto a receptor we call the insulin receptor.