Table 3.
Spacer sequences repeated either within a cluster or between different clusters of the same organism.
| Organism/ plasmid | Repeated once in a cluster | Repeated more than once in a cluster | Present in different clusters | Total no. of repeated spacers |
| H. butylicus | 2 | 4 | ||
| S. solfataricus | 1 | 3 | 8 | |
| S. tokodaii | 2 | 1 | 5 | 17 |
| S. acidocaldarius | 2 | 1 | 9 | |
| P. furiosus | 1 | 3 | 8 | |
| P. torridus | 10 | 20 | ||
| A. fulgidus | 1 | 2 | ||
| M. jannaschii | 2 | 2 | 14 | |
| M. thermautotrophicus | 18 | 36 | ||
| M. barkeri | 1 | 2 | ||
| M. mazei | 2 | 4 | ||
| H. marismortui pNG300 | 1 | 2 | ||
| H. marismortui pNG400 | 2 | 4 | ||