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phosphorylase can act only on linear chains of glycogen (?1-4 glycosidic linkage). Its work will immediately come to a halt four residues away from ?1-6 branch (which are exceedingly common in glycogen). In these situations, the debranching enzyme is necessary, which will straighten out the chain in that area. In addition, the enzyme transferase shifts a block of 3 glucosyl residues from the outer branch

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