nuclear ribonucleoprotein ( rnp ) complexes that contain the u1 and u2 rna of chromatin of novikoff hepatoma cells were extracted with 0.01 m tris-hcl ( ph 8.0 ) after the nuclei were initially washed with 0.075 m nacl and 0.025 m edta ( ph 8.0 ) .
C0008546
chromatin
C0007610
nuclei