So we have a single gamma and a single epsilon unit that actually organized. They combine to form something called essential stock. And this central stock is this elongated structure that runs through the inner cavity of that hexameric ring and it also connects to this structure that is found within the S not region as we'll see in just a moment. So the gamma and the epsilon polypeptide so the red and the blue structures organize themselves to form something called essential stalk and this runs through the inner cavity of the hexameric ring. So if we take a cross section of this structure here this is basically what we're going to see. So we have these six chains, the alpha and the beta.