title: Morphologic observations of brain tumors in PD4 hamsters induced by four strains of avian sarcoma virus.
mesh_terms: D001355:Alpharetrovirus; D000818:Animals; D001254:Astrocytoma / Q000209:etiology / Q000473:pathology; D001932:Brain Neoplasms / Q000209:etiology / Q000473:pathology*; D006224:Cricetinae; D005910:Glioma / Q000209:etiology / Q000473:pathology; D008854:Microscopy, Electron; D009374:Neoplasms, Experimental; D012513:Sarcoma, Experimental