title: Letter: Crystals in skeletal muscle in xanthinuria and in allopurinol-treated gout patients.
mesh_terms: D000493:Allopurinol / Q000009:adverse effects*; D006073:Gout / Q000378:metabolism*; D006801:Humans; D009132:Muscles / Q000032:analysis*; D011686:Purine-Pyrimidine Metabolism, Inborn Errors / Q000378:metabolism*; D014970:Xanthines / Q000032:analysis / Q000652:urine*
chemical_list: D014970:Xanthines; D000493:Allopurinol