_:vb50951134 "url:https://medlineplus.gov/genetics/condition/glycogen-storage-disease-type-v/"^^ . _:vb50951134 . _:vb50951134 . _:vb50951134 "A glycogen storage disease that is characterized by onset of exercise intolerance and muscle cramps in childhood or adolescence and that has_material_basis_in homozygous or compound heterozygous mutation in the PYGM gene, which encodes muscle glycogen phosphorylase, on chromosome 11q13."^^ . _:vb50951134 . _:vb50951134 .