title: Comments on cryologic preservation of avian RNA oncogenic viruses.
mesh_terms: D001355:Alpharetrovirus / Q000302:isolation & purification* / Q000472:pathogenicity; D000818:Animals; D001358:Avian Sarcoma Viruses / Q000302:isolation & purification / Q000472:pathogenicity; D001431:Bacteriological Techniques; D002645:Chickens; D003470:Culture Media; D005615:Freezing; D008722:Methods; D011309:Preservation, Biological; D012334:RNA, Neoplasm; D013997:Time Factors
chemical_list: D003470:Culture Media; D012334:RNA, Neoplasm