Fig. 3From: Evolutionary analysis of selective constraints identifies ameloblastin (AMBN) as a potential candidate for amelogenesis imperfectaAlignment of AMBN sequences from three enamel-less mammals with the putative ancestral mammalian AMBN sequence. Exon limits are indicated by vertical lines. The residues conserved during mammalian evolution (see Fig. 5b) are on gray background. In the aardvark genome the region containing exon 6 is deleted. (.): residue identical to the ancestral AMBN residue; (−): indel; (=): unknown amino acid; *: stop codonBack to article page