On the structure of transcriptional unit in mammalian cells.

Animals Base Sequence Carbon Isotopes Carcinoma, Ehrlich Tumor/metabolism Cell Nucleus/metabolism Centrifugation, Density Gradient DNA/metabolism DNA Replication/drug effects Dactinomycin/pharmacology Liver/analysis,metabolism Mice Molecular Weight Nucleic Acid Denaturation Nucleic Acid Hybridization Orotic Acid/metabolism Phosphates/analysis RNA/analysis,isolation & purification,metabolism RNA, Messenger/analysis RNA, Ribosomal/analysis Rats Tritium

Carbon Isotopes Phosphates RNA, Messenger RNA, Ribosomal Tritium Dactinomycin Orotic Acid RNA DNA