an increase in the mn2+ content from 1 to 10 mm in assays with rna polymerases i and ii from ( +zn ) cells and those with the single rna polymerase from ( -zn ) cells decreases the ratio of ump to cmp incorporated from 1.7 to 1.0 , 2.1 to 0.8 and 3.5 to 0.4 , respectively .
C0035678
rna polymerases i
C0035681
rna polymerase