we show that in apoptosis , double-stranded cleavage of dna generates two classes of chromatin fragments : 70 % of dna exists as long , h1-rich oligonucleosomes bound to the nucleus , and 30 % comprises short oligonucleosomes and mononucleosomes , which are depleted in h1 , enriched in hmg1 and 2 , and not attached to the nucleus .
C0008546
chromatin
C0007610
nucleus