Fig. 4

Evolution of the length polymorphic region of ORF1 in Perissodactyla. The yellow boxes correspond to a 21 bp motif, green boxes to a 33 bp motif, red boxes to a 3 bp motif and purple boxes to a 9 bp motif. Perissodactyla families that show the deletion of these motifs in ORF1 are listed within the blue text boxes. The position of the polymorphic region on the full-length elements is displayed in the bottom right of the figure