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. 2013 Jul 17;41(17):8034–8044. doi: 10.1093/nar/gkt606

Table 1.

Summary of our REPEATS data set including all publicly available CRISPR arrays

Data descriptor Archaea Bacteria
Genomes 279 2289
Genomes with CRISPRs (%) 177 (63) 877 (38)
Plasmids 41 1286
Plasmids with CRISPRs (%) 14 (34) 76 (6)
CRISPRs 643 2884
Repeats per array (median) 3–190 (15) 3–1371 (12)
Repeat lengths (median) 20–44 (29) 19–48 (30)
Spacer lengths (median) 20–50 (38) 19–70 (35)