Which of these is not a cofactor for glycogen phosphorylase, an impoant enzyme of the glycogenolysis pathway?

Ans: D. Glycogenin(Ref Harper 30/c p 181)Glycogenin:An enzyme involved in glucose conversion to glycogen.Acts as a primer - By polymerizing first few glucose molecules a enzymes take over.Involved in glycogen synthesis pathway rather than glycogenolysis.