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Table 1 Distribution of cas1-cas2 genes pair together with CRISPR in three CRISPR-Cas system types

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

CRISPR Nearby cas1-cas2 Remote cas1-cas2a Type I Type II Type III
+ +   1651 368 187
- + 36 0 66
- - 51 0 27
-b +   87 109 11
- + 52 0 84
- - 124 0 14
  1. aFor each CRISPR, we only checked for the presence of remote cas1-cas2 gene pair when no cas1-cas2 gene pair is found in the neighborhood of the CRISPR
  2. bWhen lacking the CRISPRs, we examined the cas locus containing a nearby or remote cas1-cas2 gene pair. In this table, "+" indicates presence, "-" indicates absence, and a blank cell means the corresponding aspect was not checked