title: Spontaneous feline fibrosarcomas: transmissibility and ultrastructure of associated virus-like particles.
mesh_terms: D000818:Animals; D002371:Cat Diseases / Q000209:etiology* / Q000382:microbiology*; D002415:Cats; D002474:Cell-Free System; D005354:Fibrosarcoma / Q000209:etiology* / Q000382:microbiology* / Q000473:pathology; D008722:Methods; D008854:Microscopy, Electron; D009362:Neoplasm Metastasis; D009365:Neoplasm Regression, Spontaneous; D009858:Oncogenic Viruses / Q000302:isolation & purification*; D013997:Time Factors