| AD families | AD genes | Defense system | CLAN ID | Phages/MGEs | References | Description |
|---|---|---|---|---|---|---|
| APIS119 | Ulx | restriction-modification (RM) | CLAN051 | Escherichia phage P1 | PMID:28509398 | Ulx is a protein included in the P1 antirestriction system. It acts as a chaperone or packaging factor to increase the amount of DarB incorporated into the virion. |