title: Spontaneous rat malignant tumors of fibrohistiocytic origin: an ultrastructural study.
mesh_terms: D000005:Abdomen; D000818:Animals; D005260:Female; D005350:Fibroma / Q000648:ultrastructure / Q000662:veterinary*; D007866:Leg; D051381:Rats; D011919:Rats, Inbred Strains; D012376:Rodent Diseases / Q000473:pathology*; D012983:Soft Tissue Neoplasms / Q000648:ultrastructure / Q000662:veterinary*