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Table 4 CRISPR arrays found in safe strains.

From: The genome sequence of E. coli W (ATCC 9637): comparative genome analysis and an improved genome-scale reconstruction of E. coli

  CRISPR array
  2.1 2.2 2.3 4.1-2
W 16a 3 11 2
K-12 14a 3 7 2
B 5 3 14 2
Crooks 22a 3 29b 4
  1. a CAS-E genes proceed array
  2. b IS element occurs within array
  3. Strains are W (ATCC 9637), K-12 (MG1655), B (REL606), and Crooks (ATCC 8739).