An electron micrograph showing glycogen granules forming highly ordered, honeycomb structures in the subsarcolemmal area of muscle fibers, in a patient with glycogen storage disease due to a mutation in the PYGM gene, which codes for myophosphorylase, the enzyme catalyzing the initial step of glycogen breakdown. See Echaniz‐Laguna et al., pp. 274–282, in this issue.
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