Table 1.

Results from the RRTree test comparing substitution rates in Rodentia, Scandentia and the other mammals.

Group	%GC	Ka	Ks
Rodentia and Scandentia (n = 6)	49.9	0.304	0.635
Other Mammals (n = 20)	44.9	0.235	0.527
p-value		< 0.01	0.025