| KEGG ID | KO | Definition |
| ilo:IL2397 | K06193 | Uncharacterized Zn-ribbon-containing protein involved in phosphonate metabolism |
| ili:K734_12065 | K06193 | hypothetical protein |
| ipi:CEW91_01090 | K06193 | alkylphosphonate utilization protein |
| ome:OLMES_2599 | K06193 | alkylphosphonate utilization operon protein PhnA |