Single-homeobox s DUX. a) Schematics of identified sDUX exons. Asterisk denotes missing synteny information. Number in brackets corresponds to copy number in diagram below. b) Map of sDUX genes relative to anchors. All locations, genes sizes and distances drawn to scale. Red arrows = two sDUX exons including intron. Orientation of arrow indicates strand orientation. Distance between lizard Anxa11 and CJ057 too large to show to scale. c) Amino acid alignment of homeodomain. Duxbl homeodomains 1 and 2 included for comparison. Arrow marks splice junction. Conserved residues shaded as in Figure 4.