| WT | Wild type |
| ΔsprB | sprB deletion mutant CJ1922 |
| T9SS | Type IX secretion system |
| EPM | Extracellular polymeric matrix |
| TEM | Transmission electron microscopy |
| WT | Wild type |
| ΔsprB | sprB deletion mutant CJ1922 |
| T9SS | Type IX secretion system |
| EPM | Extracellular polymeric matrix |
| TEM | Transmission electron microscopy |