FIG 5 .

Graphical depiction of minor CRISPR2.1 arrangements for Shigella and E. coli strains. Each arrangement variant is denoted with the letter of the main arrangement from which it could have derived and a subscript number. The names of the IS encountered are indicated. Each genetic element is distinctively colored. Nontruncated cas genes are in yellow and partial or interrupted sequences in red. cas2 is referred to as “2.” Arrangement A₅ is deduced from unpublished results from C. Díez-Villaseñor. The arrangements of E. albertii TW07627 (E.al) and S. enterica Choleraesuis SC-B67 (S.en), with their distinctive regions, are also included.