Table 2.

Support for three possible topologies based on ML analysis of the concatenated amino acid sequences of the 12 H-strand encoded mitochondrial protein-coding genes

	Xenopus			Chicken			Xenopus plus chicken
	Δln L	σ	pBoot	Δln L	σ	pBoot	Δln L	σ	pBoot
ML analysis of 9 mammalian taxa and different outgroups*
Marsupionta	〈−31,284〉		93.1	〈−31,411〉		51.5	〈−32,536〉		75.9
Theria	−47.0	20.0	0.2	−18.2	16.7	5.3	−26.8	18.6	4.5
Unnamed	−30.9	21.8	6.7	−2.5	18.7	43.2	−15.8	19.8	19.6
ML analysis of 23 mammalian taxa and different outgroups†
Marsupionta	〈−44,981〉		92.1	〈−45,107〉		52.4	〈−48,370〉		69.2
Theria	−36.7	19.1	2.0	−14.3	16.0	9.2	−27.5	16.5	1.9
Unnamed	−28.5	20.2	5.9	−2.4	17.6	38.4	−10.1	18.9	28.9

The likelihood value of the best topology is shown in angle brackets. The differences of log-likelihood values of alternative trees relative to that of the best tree (Δln L) as well as the standard deviations (σ) are shown (64). pBoot indicates the estimated bootstrap probability (65) among the three alternatives. 

^*Mammals included platypus, opossum, wallaroo, rat, mouse, Caucasian human, harbor seal, cow, and whale. 

^†Mammalian taxa as in Fig. 3.