PD-T7-3 systems were discovered to be anti-phage systems during an experimental screen performed on *E. coli* strains :ref{doi=10.1038/s41564-022-01219-4}
## Molecular mechanisms
As far as we are aware, the molecular mechanism of PD-T7-3 is unknown.
## Example of genomic structure
## Example of genomic structure
The PD-T7-3 system is composed of one protein: PD-T7-3.
The PD-T7-3 system is composed of one protein: PD-T7-3.