Table 3.

Structural alignment statistics, as given by SSM Tool (30)

Name	PDB	Residues	Sequence identity (%)	r.m.s.d. (Å)	Color as in Figure 5
RNase LE	1DIX	208	33	1.50	Gray
RNase MC1a	1UCG	190	28	1.61	Pale cyan
RNase MC1	1BK7	190	29	1.59	Not shown
RNase NW, chain B	1IYB	208	31	1.66	Light gray

^aFor the figure, the mutant N71T was chosen as the structure shows a slightly lower r.m.s.d. with our protein than the wild type. All r.m.s.d. values are in comparison to RNase T2, but only for the compared sequence part.