electron microscopic radioautography combined with the ao ultracytochemistry revealed that silver grains indicating binding of 3h-actinomycin d are located mostly over the euchromatin portion near the segregated nucleolus and heterochromatin and that no or only a few ao chromatin complex was found in nuclei labeled heavily with 3h-actinomycin d .
C0008546
chromatin
C0007610
nuclei