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AMELX organization in the mouse genome showing the 10 exons: exons 1 to 9 and the putative exon 4b. Exon 4b and exon 8 were created after the DNA region containing exon 4 and exon 5 was duplicated and translocated downstream of exon 7 (arrow). The regions that were explored in various genomes for exons 4, 4b, 8, and 9 (gray blocks) are indicated with brackets.
