when rat liver nuclei are isolated in the presence of the irreversible sulfhydryl-blocking reagent iodoacetamide , digested with dnase i and rnase a , and extracted with 1.6 m nacl , nuclear envelope ( ne ) spheres depleted of intranuclear material , as analysed by thin-section electron microscopy , are obtained .
C0007610
nuclei
C0028584
nuclear envelope