chromatography of fraction 5 on single-stranded dna-cellulose gives an enzyme fraction , bs i , that is indistinguishable from b. subtilis rna polymerase holoenzyme both in its peptide composition ( betabeta'alpha ( 2 ) sigma ) and in the selective transcription of only t7 rnas a ( 1 ) and c .
C0035679
b
C0040649
transcription