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Table 1 Summary of the characteristics and number of CRISPRs.

From: The CRISPRdb database and tools to display CRISPRs and to generate dictionaries of spacers and repeats

DR length Number of CRISPRs (percentage %)
  Bacteria Archaea Total
47 1 (<1) 0 1 (<1)
38 3 (<1) 0 3 (<1)
37 55 (14.7) 14 (8.9) 69 (13)
36 69 (18.4) 9 (5.7) 78 (14.7)
35 10 (2.7) 1 (<1) 11 (2.6)
34 1 (<1) 0 1 (<1)
33 4 (1) 0 4 (<1)
32 31 (8.3) 1 (<1) 32 (6)
31 6 (1.6) 2 (1.3) 8 (1.5)
30 51 (13.6) 46 (29.1) 97 (18.2)
29 68 (18.1) 9 (5.7) 77 (14.4)
28 67 (17.9) 7 (4.4) 74 (13.9)
27 2 (0.53) 2 (1.7) 4 (<1)
26 1 (0.27) 0 1 (<1)
25 6 (1.6) 37 (23.4) 43 (8)
24 0 30 (19) 30 (5.7)
Total Number 375 158 533
Mean Length 32 32 32
  1. Only confirmed CRISPRs are counted. The first column shows the DR length. In the second and the third columns are shown the number of clusters having the corresponding DR length in Bacteria and Archaea respectively (the percentage of CRISPR DR having this length is indicated). Only one strain per species is counted. In the last column, the two populations of CRISPRs are merged. The last two lines are respectively the total number of CRISPRs in each category, and the average DR length.