nuclei accumulating either [ 3h ] pga2 or [ 3h ] delta 12-pgj2 were extracted successively with a hypotonic solution and with a 1 % triton x-100 solution , and the radioactivities in the two extracts ( fractions of nucleoplasm and nuclear membrane , respectively ) and the remaining residues ( a fraction of chromatin and nuclear matrix ) were determined .
C0007610
nuclei
C0028581
nuclear matrix