What is the name of protein molecule A found at the core of Glycogen What is the main purpose of

The name of the protein molecule A found at the core of Glycogen is Glycogenin.

The main purpose of Glycogenin is to serve as the primer for glycogen synthesis. It catalyzes the formation of a short glucose chain, which acts as the initiation point for glycogen synthesis. It also helps in the elongation of the glycogen molecule by serving as a template for the addition of more glucose molecules.