this fraction , released by mild staphylococcal nuclease digestion of isolated nuclei , contains 2 to 10 % of the dna as polynucleosomal chromatin together with 50-70 % of pulse-labelled rna and about 90 % of all template-engaged rna polymerase b molecules , titrated with ( 3h ) -alpha-amanitin .
C0007610
nuclei
C0008546
chromatin