On visna virus: purification and nucleic acid content.

Acetates Amino Acids/metabolism Animals Carbon Isotopes Centrifugation, Density Gradient Chemical Precipitation Choroid Plexus Culture Techniques Cytopathogenic Effect, Viral Dialysis Methods Prions/analysis,isolation & purification,pathogenicity RNA, Viral/analysis Sheep Sucrose Thymidine/metabolism Tritium Uridine/metabolism Zinc

Acetates Amino Acids Carbon Isotopes Prions RNA, Viral Tritium Sucrose Zinc Thymidine Uridine