| CDS description | CDS accession | Island | Host Description |
|---|
| putative CRISPR-associated protein Cas4 | NC_000854:770000:783636 | NC_000854:770000 | Aeropyrum pernix K1, complete genome |
| putative CRISPR-associated protein Cas4 | NC_012108:616088:629012 | NC_012108:616088 | Desulfobacterium autotrophicum HRM2, complete genome |