It's because of this reaction, because this is continually being depleted, that this reaction actually takes place in the product favor direction. So this is an important reaction because it ensures that we continually produce the UDP glucose molecules. Now, once we produce the UDP glucose molecules, the next step is to basically generate a primer molecule. So remember that a primer molecule is basically a short sequence of glucose nucleotides which are connected by alpha one four glycocytic bonds. So why do we need a primer molecule? Because the enzyme that elongates that glycogen chain, known as glycogen synthase, needs a primer to actually initiate that elongation process.