Now, glycogenin is a dimer molecule. It consists of two identical polypeptide chains. And so what the glycogenin does is it basically creates the primer from scratch. It creates the primer by basically using the activated glucose molecule, the urine divide, phosphateate glucose molecules. And as soon as that primer is actually synthesized by glycogenin, that's when glycogen synthase actually takes over and begins synthesizing the Alpha one four glycocitic bonds. Now, the thing about glycogen synthase is not only does it actually require that primer, but it can only synthesize the Alpha one four glycocitic bonds.