Enzymatic lengthening and degradation of glycogen occurs only at the non-reducing ends.

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Glycogen is a highly branched polymer of glucose that is mainly stored in liver and muscle cells. Enzymatic lengthening of glycogen occurs only at the non-reducing ends, which means that glucose molecules can only be added to the end of the glycogen branch that does not have a free glucose molecule. Similarly, enzymatic degradation of glycogen occurs only at the non-reducing ends, which means that glucose molecules are removed from the end of the glycogen branch that does not have a free glucose molecule. This process is catalyzed by the enzyme glycogen phosphorylase.

Enzymatic Lengthening and Degradation of Glycogen Occurs Only at the Non-Reducing