title: ANALYSIS OF THE DEFECTIVENESS OF ROUS SARCOMA VIRUS. I. CHARACTERIZATION OF THE HELPER VIRUS.
mesh_terms: D001354:Avian Leukosis Virus; D001358:Avian Sarcoma Viruses; D002498:Centrifugation; D006378:Helper Viruses; D006358:Hot Temperature; D007372:Interferons; D009500:Neutralization Tests; D012106:Research; D052736:Rous sarcoma virus; D046509:Tissue Culture Techniques; D014776:Virus Cultivation
chemical_list: D007372:Interferons
keywords: AVIAN LEUKOSIS VIRUS; CENTRIFUGATION; EXPERIMENTAL LAB STUDY; HEAT; INTERFERON; NEUTRALIZATION TESTS; ROUS SARCOMA VIRUS; TISSUE CULTURE; VIRUS CULTIVATION