liver nuclei , nucleoli and p-3 ( a transcriptionally active subnucleolar fraction that is 3.4-fold enriched in active rdna ) were isolated and the binding of afb1 to dna and protein of each fraction was determined by dnase i digestion and 5 % trichloracetic acid ( tca ) hydrolysis .
C0007610
nuclei
C0007609
nucleoli