Figure 4.

Maximum-likelihood phylogram for mysticete CHR-2 SINE sequences (−ln L = 1068.74802). The clade of SINE sequences from the MMP20 locus is coloured black, and groupings that are congruent with the supermatrix topology of McGowen et al. [38] are marked by grey circles at nodes. The CHR-2 SINE tree was rooted with Megaptera novaeangliae Hump14, which belongs to the DT subfamily. Bootstrap scores greater than 70% are shown. Branch lengths are proportional to the amount of change in nucleotide substitutions per site. Mysticete genera are abbreviated as follows: Balaenoptera, B.; Balaena, Ba.; Caperea, C.; Eschrichtius, Es.; Eubalaena, Eu.; Megaptera, M. Scale bar, 0.01 substitutions per site.