Whole genome XhoI restriction map of E. coli O157 generated by shotgun optical mapping. The outer circle represents an in silico XhoI digest of the sequence. The second outermost circle shows the consensus optical map. The inner circles represent the individual molecule maps from which the consensus map was generated. XhoI fragment sizes (in kilobases) can be measured from the figure. Colors are arbitrarily assigned to homologous overlapping fragments. The white triangles show discrepancies between the sequence and the optical map.
Courtesy Genome Research