we have further characterised a fraction of polynucleosomal chromatin from mouse cells which is enriched in transcribing regions , after separation by multistep partition in a dextran /poly ( ethylene glycol ) two-phase mixture [ faber , a. j . ( 1972 ) methods cell biol . 16 , 447 -- 457 ] .
C0008546
chromatin
C0007634
cell