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. 2022 Mar 30;122(8):1751–1772. doi: 10.1007/s00421-022-04935-1

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Fig. 2 — Mechanisms of phosphorylase-mediated breakdown of glycogen. Vertical arrow denotes increase. As discussed in text, none of the classical mechanisms or current explanations have been demonstrated experimentally to account for the high rates of glycogenolysis in living muscle