The DNA-dependent RNA polymerase activities in nuclei isolated from adult Sarcophaga bullata are unusual in their responses to metal ions, ionic strength and inhibitors. There is an activity that is sensitive both to rifamycin and to α-amanitin. The activity is less sensitive to Bacillus thuringiensis exotoxin than is larval polymerase, and low concentration of exotoxin provoke a slight stimulation.

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