Table 1. Mitochondrial substitution rates of Castor differ significantly from those of other rodents.

	Median rate at tips	Median rates averaged
Castor vs. rest of mouse-clade	U = 36, p-value  = 0.004998 **	U = 42, p-value  = 0.002591 **
Castor vs. rest of rodents	U = 58, p-value  = 0.01375 *	U = 60, p-value  = 0.007005 *
Castor vs. rest of glires	U = 62, p-value  = 0.1075	U = 60, p-value  = 0.1457

Results of Mann-Whitney U-tests testing the null hypothesis that substitution rates for Castor are identical to the rates of other rodents (Wilcoxon rank sum test with continuity correction as implemented in R).

*: significant, <0.05;

**: highly significant, <0.005.