| AD families | AD genes | Defense system | CLAN ID | Phages/MGEs | References | Description |
|---|---|---|---|---|---|---|
| gp54 | gp54 | superinfection exclusion | CLAN033 | Mycobacterium phage Tweety | PMID:28067906 | A tetrapeptide repeat protein that acts as a highly effective counter-defense system by preventing activation of (p)ppGpp synthesis encoded by Phrann prophage-mediated defense system. |