Table 1.

Predicted stability of endosymbionts compared with outgroups (ΔG, in kcal/mol)

Taxon	Regions of Domain I of 16S rRNA						Total
	122	240	65	52	39	27
P. vulgaris	−13.9	−8.2	−5.7	−17.2	−14.9	−30.7	−90.6
E. coli	−17.0	−12.0	−4.2	−14.3	−14.9	−31.2	−93.6
Aphid endosymbiont (Sg)	−15.0	−7.2	−4.5	−14.3	−11.9	−21.6	−75.6
Aphid endosymbiont (Sc)	−7.8	−0.9	−8.0	−14.3	−11.9	−22.1	−65.0
Aphid endosymbiont (Mk)	−9.6	−7.4	−7.6	−14.3	−11.9	−21.8	−72.6
Aphid endosymbiont (Mp)	−6.8	−7.2	−8.4	−14.3	−11.9	−21.6	−70.2
Ant endosymbiont	−13.3	−8.9	−4.8	−18.3	−15.4	−16.8	−77.5
Tsetse fly endosymbiont	−13.9	−9.4	−7.2	−18.3	−13.3	−24.0	−86.1
O. linum	−12.2	−9.6	−7.3	−15.7	−16.8	−28.3	−89.9
Whitefly endosymbiont	−4.0	−6.1	−1.0	−17.2	−15.4	−22.3	−66.0
A. eutrophus	−17.2	−9.1	−7.5	−21.2	−15.4	−29.0	−99.4
Mealybug endosymbiont	−9.4	−4.6	−6.0	−21.2	−9.7	−29.4	−80.4
A. tumefaciens	−14.3	−11.3	−3.1	−16.4	−17.9	−26.5	−89.5
W. pipientis	−0.8	−6.9	−7.9	−15.5	−17.9	−16.7	−65.7

Stabilities calculated separately for six parts of Domain I. Numbers are −ΔG, the change in free energy associated with the structure.