these retention mechanisms operate at an intranuclear level preceding the ribosomal ribonucleoprotein passage through the nuclear envelope pore complexes , i.e. , the nuclear envelope regulates neither the number of potentially transportable ribosomal ribonucleoprotein particles in nuclei nor the number of those particles which can be maximally exported from nuclei at a given temperature .
C0028587
nuclear
C0028584
nuclear envelope