Figure 3.

16S Neighbor-joining tree of selected vertebrate taxa. Neighbor-joining tree of selected vertebrate taxa based on the fragment of the 16SrRNA gene amplified by primers 16SaL and 16SbH. Numbers in black circles indicate major clades that were recovered by this analysis: (1) cartilaginous fishes, (2) salamanders, (3) frogs, (4) turtles, (5) eutherian mammals, (6) mammals, (7) squamates, (8) birds.