initial rates of [ 3h ] utp incorporation into these nuclei were relatively high ( 2-4 pmol ump/micrograms dna per min ) , and 70 to 80 % of transcription was resistant to alpha-amanitin , which is similar to the percentage of nuclear label associated with the nucleoli in electron microscopic autoradiograms .
C0007610
nuclei
C0007609
nucleoli