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. And through the inner cavity we have that stock that is made up of this red structure as well as this blue structure as we see in this particular diagram. Now, what's the function of this gamma epsilon central stock? Well, the GAM epsilon central stock will essentially connect this structure shown in orange to this structure here.