after a single subcutaneous dose of testosterone , rna polymerase activity assayed in intact nuclei in the presence of mg2+ and alpha-amanitin ( nucleolar rna polymerase i ) , as well as the enzyme activity sensitive to low concentration of the toxin ( nucleoplasmic rna polymerase ii ) , increased within 15 min and attained peak values at 2 and 1 h , respectively .
C0007610
nuclei
C0682537
nucleoplasmic