Template specificities of Xenopus laevis RNA polymerases. Selective transcription of ribosomal cistrons by RNA polymerase A.

Animals Bacillus Centrifugation, Density Gradient DNA/isolation & purification DNA-Directed RNA Polymerases/antagonists & inhibitors,metabolism Dactinomycin/pharmacology Female Guanine Nucleotides/metabolism Nucleic Acid Hybridization Operon Ovary/enzymology RNA, Ribosomal/biosynthesis,isolation & purification Rifamycins/pharmacology Templates, Genetic Toxins, Biological/pharmacology Transcription, Genetic Tritium Uracil Nucleotides/metabolism Xenopus

Guanine Nucleotides RNA, Ribosomal Rifamycins Toxins, Biological Uracil Nucleotides Tritium Dactinomycin DNA DNA-Directed RNA Polymerases