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. And we basically form and extend it. So we extend that primer by one and we also form the UDP, which is basically shown here. So UDP is urine diphosphate, it contains the uridine and two phosphate groups.