| Strain | Description | Forms biofilm? |
| Rm8530 expR+ | Positively regulates EPS II synthesis | Yes |
| Rm8530 exoY | Suppresses EPS I production | Yes |
| Rm9034 expG | Missing expG, a transcriptional activator for the EPS II regulating gene | Yes |
| Rm1021 | Does not produce EPS II unless in a low phosphate setting | No |
| Rm9030-2 expA1 | Contains gene that inhibits EPS II synthesis | No |