SLSs and sequence repeats. A) Repeated DNA families spanning SLSs identified in different prokaryotic species are listed. B) The consensus sequence of the Bordetella Bor repeats is shown at the top. Sequence identities with the E.coli REP z1 sub-type are highlighted. N, any nucleotide; R, purine. The relative abundance of the 26- and 30-bp long members of the Bor family in sequenced Bordetella genomes is reported.