Conditional lethal mutants of avian sarcoma viruses. I. Physiology of ts 75 and ts 149.
D001355:Alpharetrovirus / Q000276:immunology / Q000302:isolation & purification / Q000378:metabolism / Q000502:physiology*; D000818:Animals; D000937:Antigen-Antibody Reactions; D002471:Cell Transformation, Neoplastic; D002642:Chick Embryo