And so this is the primer that we have here. So let's say this primer consists of N number of glucose molecules which are all connected by alpha one four glycocitic bonds. So we have not yet created any branching points. And so this is a linear unbranched polymer. So in the next step, once we generate that primer by using the UDP glucose molecules and the enzyme we call glycogenin. Now, glycogen synthase takes the primer and takes the UDP glucose shown here and basically catalyze the formation of that alpha one four glycocytic bond between this glucose here and the terminal glucose molecule of this primer.