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Age-dependent changes in glycogen structure in Epm2a–/– mice. Electron micrographs of skeletal muscle glycogen purified from: 3-month-old wild type (WT)(A); 9–12-month-old wild type (B); 3-month-old Epm2a–/– (C); 9–12-month-old Epm2a–/– (D); and size distribution of skeletal muscle glycogen particles purified from wild type and Epm2a–/– mice (E).
