Table 3. CRISPR counts.
| Organism | CRISPRs | CAS genes |
| Haloferax mucosum ATCC BAA-1512 | 16 | 7 |
| Haloferax denitrificans ATCC 35960 | 12 | 7 |
| Haloferax sulfurifontis ATCC BAA-897 | 10 | 6 |
| Haloferax mediterranei ATCC 33500 | 5 | 7 |
| Haloferax volcanii DS2 | 4 | 6 |
| Haloarcula californiae ATCC 33799 | 6 | 4 |
| Haloarcula marismortui ATCC 43049 | 5 | 7 |
| Haloarcula sinaiiensis ATCC 33800 | 3 | 6 |
| Haloarcula vallismortis ATCC 29715 | 1 | 0 |
| Halorubrum lacusprofundi ATCC 49239 | 3 | 11 |
| Halomicrobium mukohataei DSM 12286 | 2 | 6 |
| Halorhabdus utahensis DSM 12940 | 2 | 6 |
| Natronomonas pharaonis DSM 2160 | 4 | 6 |
| Halobacterium salinarum R1 | 0 | 0 |
| Halobacterium sp NRC-1 | 0 | 0 |
| Haloquadratum walsbyi DSM 16790 | 0 | 0 |
| Halogeometricum borinquense DSM 11551 | 1 | 0 |
| Halalkalicoccus jeotgali B3 | 0 | 0 |
| Natrialba magadii ATCC 43099 | 2 | 0 |
| Haloterrigena turkmenica DSM 5511 | 1 | 0 |
| Halopiger xanaduensis SH-6 | 0 | 0 |
Note: Number of CRISPRs is the number of distinct CRISPR clusters.