title: In vivo and in vitro recovery of defective Friend virus by various leukemia viruses.
mesh_terms: D000818:Animals; D000917:Antibody Formation; D002460:Cell Line; D002474:Cell-Free System; D046508:Culture Techniques; D003673:Defective Viruses; D005260:Female; D005622:Friend murine leukemia virus / Q000254:growth & development / Q000302:isolation & purification*; D007942:Leukemia, Experimental; D016403:Lymphoma, Large B-Cell, Diffuse / Q000382:microbiology; D008297:Male; D051379:Mice; D008979:Moloney murine leukemia virus / Q000254:growth & development / Q000302:isolation & purification; D012190:Retroviridae / Q000254:growth & development / Q000302:isolation & purification; D012513:Sarcoma, Experimental; D013950:Thymus Gland / Q000473:pathology; D014020:Tissue Extracts; D014762:Viral Interference; D014774:Virulence; D014776:Virus Cultivation
chemical_list: D014020:Tissue Extracts