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We observed 2 additional adults with phosphorylase <jats:italic>b<\/jats:italic> kinase deficiency: Patient 1, aged 58, had progressive, predominantly distal weakness since age 46 but no cramps on exertion; Patient 2, aged 26, had cramps on exertion since age 6 but no weakness. Lactate production on ischemic exercise was impaired only in Patient 1. The serum creatine kinase level was elevated in both. Muscle specimens showed focal glycogen excess in both, and a necrotizing myopathy and mild denervation atrophy in Patient 1. Muscle phosphorylase <jats:italic>b<\/jats:italic> kinase activity was 0.5% and 8.9% of the lowest control value in Patients 1 and 2, respectively; erythrocyte phosphorylase <jats:italic>b<\/jats:italic> kinase activity was normal in both; liver phosphorylase <jats:italic>b<\/jats:italic> kinase activity, measured in Patient 1, was also normal. Other glycolytic enzymes in muscle were preserved in both.<\/jats:p>","DOI":"10.1002\/ana.410280410","type":"journal-article","created":{"date-parts":[[2005,1,1]],"date-time":"2005-01-01T14:27:34Z","timestamp":1104589654000},"page":"529-538","source":"Crossref","is-referenced-by-count":35,"title":["Adult phosphorylase <i>b<\/i> kinase deficiency"],"prefix":"10.1002","volume":"28","author":[{"given":"Paula R.","family":"Clemens","sequence":"first","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Masahiko","family":"Yamamoto","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Andrew 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