in about 40 % of the multinucleate erythroblasts , only some of the nuclei within the same cell incorporated 3h-thymidine and the electron microscope autoradiographic studies revealed that the nuclei which failed to synthesize dna virtually always showed abnormalities in the electron-density of the heterochromatin or euchromatin or a swiss-cheese appearance of the heterochromatin .
C0007634
cell
C0007610
nuclei