The a subunit in the RNA of transforming avian tumor viruses. I. Occurrence in different virus strains. II. Spontaneous loss resulting in nontransforming variants.

Animals Avian Sarcoma Viruses/analysis,growth & development Cell Transformation, Neoplastic Chick Embryo Culture Techniques Electrophoresis, Disc Fibroblasts Genetic Variation Genetics, Microbial Hot Temperature Molecular Weight Mutation Phosphorus Isotopes RNA, Viral/analysis Tritium Uridine

Phosphorus Isotopes RNA, Viral Tritium Uridine