4 component system: The ATP-binding Cassette (ABC) Superfamily
| Q8Y5W0 | Riboflavin transporter |
|---|---|
| Q8Y456 | Energy-coupling factor transporter transmembrane protein EcfT |
| Q71WH7 | Energy-coupling factor transporter ATP-binding protein EcfA1 |
| Q71WH8 | Energy-coupling factor transporter ATP-binding protein EcfA2 |