title: Polymyositis: an ultramicroscopic study of muscle biopsy material.
mesh_terms: D000328:Adult; D002467:Cell Nucleus; D002648:Child; D003593:Cytoplasm; D003594:Cytoplasmic Granules; D005260:Female; D006801:Humans; D008297:Male; D008853:Microscopy; D008854:Microscopy, Electron; D008931:Mitochondria, Muscle; D009132:Muscles / Q000473:pathology*; D009210:Myofibrils; D009220:Myositis / Q000473:pathology*