Figure 1. Relationships of the amniote lineages (in bold) for which amelogenin was used in this study (adapted from Madsen et al., 2001; Murphy et al., 2001; Janke et al., 2005; Vidal and Hedges, 2005). The number of species in each clade is indicated between the brackets. See APPENDIX 1 for information on the species and sequences.