title: Isolation of a rat-tropic helper virus from M-MSV-O stocks.
mesh_terms: D000818:Animals; D000941:Antigens / Q000032:analysis; D002460:Cell Line; D002471:Cell Transformation, Neoplastic; D002499:Centrifugation, Density Gradient; D003470:Culture Media; D017988:Gammaretrovirus / Q000254:growth & development / Q000276:immunology / Q000302:isolation & purification* / Q000472:pathogenicity; D006378:Helper Viruses / Q000254:growth & development / Q000276:immunology / Q000302:isolation & purification / Q000472:pathogenicity; D007106:Immune Sera; D007668:Kidney; D051379:Mice; D009374:Neoplasms, Experimental; D009500:Neutralization Tests; D051381:Rats; D013045:Species Specificity; D013395:Sucrose; D014316:Tritium; D014529:Uridine / Q000378:metabolism; D014779:Virus Replication
chemical_list: D000941:Antigens; D003470:Culture Media; D007106:Immune Sera; D014316:Tritium; D013395:Sucrose; D014529:Uridine