... these RNases H, such as E coli RNase HI, BsuRNase HIII, and Bst -RNase HIII, prefers Mg2+ to Mn2+ for activity, whereas other three, such as E coli RNase HII, Bsu -RNase HII, and Bst -RNase HII, ... Escherichia coli cells contain RNases HI and HII, yeast and human cells contain RNases H1 and H2 , and Bacillus subtilis and Bacillus stearothermophilus cells contain RNases HII and HIII The physiological ... Mn2+ to Mg2+ for activity The specific activities of E coli RNase HI, Bsu -RNase HIII, and Bst -RNase HIII are higher than E coli RNase HII, Bsu -RNase HII, and Bst -RNase HII by 13, 20, and 100 times,...