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Table 2 Characterization of the “CRISPR” clusters according to the cas genes and spacer diversity

From: Not all predicted CRISPR–Cas systems are equal: isolated cas genes and classes of CRISPR like elements

% co-location # of clusters # of CRISPRs
cas-near cas-far cas genes not found in the genome
d+ d- d+ d- d+ d- short
Singletons 2996 477 4 767 473 689 518 68
[0,0.1) 615 4 7 1365 587 947 614 87
[0.1,0.2) 13 34 0 216 0 11 0 0
[0.2,0.3) 24 79 3 194 0 38 0 0
[0.3,0.4) 32 85 0 142 0 13 0 0
[0.4,0.5) 19 240 0 212 0 52 0 0
[0.5,0.6) 81 202 0 145 0 34 0 0
[0.6,0.7) 37 177 0 75 0 20 0 0
[0.7,0.8) 29 884 0 205 0 66 0 0
[0.8,0.9) 21 286 0 43 0 5 0 0
[0.9,1) 11 353 0 11 0 5 0 0
1 340 1292 0 0 0 0 0 0
  1. Descriptions of the columns: “% co-location” shows the percentage of CRISPRs co-locating with cas genes in each cluster; “d+” represents that CRISPR contains diverse spacers, whereas “d-” indicates no spacer diversity was observed; “short” represents short CRISPRs (with two spacers without spacer diversity)