endogenous nuclease digestion of thymus nuclei from 3-4 week old rats followed by a step wise extraction with low salt , 0.5 m salt and 1 m salt removed approximately 70-85 % of total nuclear terminal deoxynucleotidyl transferase ( tdt ) whereas approximately 15-30 % of the enzyme remained tightly bound to the residual nuclear matrix .
C0007610
nuclei
C0028581
nuclear matrix