Fig. 2.

An interordinal mammalian phylogeny reconstructed by our retroposon insertion analysis. Downward arrows denote insertions of retroposons into each lineage. Locus INT283, denoted by a dashed arrow, supports the monophyly of Cetartiodactyla, Perissodactyla, and Carnivora. The loci surrounded by dashed lines in Afrotheria were identified in our previous study (22). Asterisks below the branches denote that the monophylies are statistically significant (∗, P < 0.05; ∗∗, P < 0.01; ∗∗∗, P < 0.001).