Table 1

Number of RNase H genes identified in the archaeal and bacterial species.

Kingdom
Type
No. of species
No. of RNase H genes







1
2
3

Archaea
RNase HI
9
6
3
0

RNase HII
27
27
0
0

RNase HIII
1
1
0
0






Bacteria
RNase HI
210
173
32
5

RNase HII
220
219
1
0

RNase HIII
40
40
0
0

Kochiwa et al. BMC Evolutionary Biology 2007 7:128   doi:10.1186/1471-2148-7-128