differential sensitivity of the thio-rna classes to low ( 1 microgram/ml ) and high ( 200 micrograms/ml ) concentrations of alpha-amanitin disclosed that beta-s-atp was used for initiation of transcription by all three classes of rna polymerases , and that thio-rna included molecules as large as 18s initiated by rna polymerase ii .
C0035681
rna polymerases
C0035679
rna polymerase