Figure 1.

The location of insertion elements in the 5'-flanking regions of rp genes. Insertion (ins) elements were identified by the RepeatMasker program in scans of up to one kilobase of sequence 5' of the tsp, and the location of the element nearest to the tsp recorded for 79 human and mouse rp genes [see Additional file 2]. The distance from the tsp was divided into 200 bp intervals, the percentage of rp genes with an element within each interval determined, and the values plotted cumulatively against the distance from the tsp.