Fig. 2

Independent pseudogenizations or losses of sox15 during marsupial or reptilian speciation. a Independent pseudogenization of sox15 during marsupial speciation. (ψ) indicates pseudogenization of sox15. Numbers from the first nucleotide in 225 nucleotide sequences encoding the HMG box are shown in the nucleotide alignment. In-frame stop codons and deletions with frame shift mutation are highlighted by gray boxes. Asterisks denote identical nucleotides among seven species following alignment. MRCA denotes most recent common ancestor. b, c Independent losses of sox15 in two lineages during reptilian speciation: Squamata including lizards and snakes (b) and Archosauromorpha including Testudines, crocodilians, and birds (c). “num. species” denotes the number of species examined in each lineage. Presence or loss of sox15 is shown as + or −. “unknown” indicates that the existence of sox15 was not determined in this analysis