using a psoralen crosslinking , radioactive labelling technique , we have previously been able to study ternary transcription complexes containing dna-dependent rna polymerases i and ii which are released from rat liver nuclei by endogenous nuclease digestion [ sargan and butterworth , refs 1 and 2 ] .
C0040649
transcription
C0035678
dna-dependent rna polymerases i