4 component system: The ATP-binding Cassette (ABC) Superfamily
| Q9A197 | Putative ferrichrome ABC transporter aka SiuA aka Spy0386 |
|---|---|
| Q9A198 | Ferrichrome ABC transporter aka SiuD aka Spy0385 |
| Q9A199 | Putative ferrichrome ABC transporter aka SiuB aka Spy0384 |
| Q06A41 | FtsD |