Representative related empty sites (RES) of ATon-I members. The top of each pair of sequences contains an ATon-I member and the bottom sequence is a corresponding RES sequence that does not contain the ATon. The target nucleotides “A” and “T” are shown in bold. The accession number for the contig bearing each displayed sequence is shown on the left. Two scenarios are shown: one with the insertion of an element between “A” and “T” (top) and the other with the duplication of “AT” upon insertion of an element (bottom).