Conserved sequences in the Dlx1/Dlx2 intergenic region. (A) Schematic representation of the Dlx1/Dlx2intergenic region of five vertebrate species. The third exons of theDlx genes are indicated. The position of the polyadenylation sequence in the Dlx genes of Spheroides andTakifugu is an estimate. In addition to the I12a and I12b sequences, ovals labeled “c” represent a region of sequence conservation between the three teleost fish species. (B) Percentage identity for I12a and I12b in pairwise sequence comparisons.