| RE1 | RE2 | RE3 | |
| Wild type srfA: | 5′-TTTCGGcatc | CCGCATgaaact | TTTCAC-3′ |
| Consensus RE3: | 5′-TTTCGGcatc | CCGCATgaaact | TTGCGG-3′ |
| Consensus RE1-RE3: | 5′-TTGCGGcatc | CCGCAAgaaact | TTGCGG-3′ |
| RE1 | RE2 | RE3 | |
| Wild type srfA: | 5′-TTTCGGcatc | CCGCATgaaact | TTTCAC-3′ |
| Consensus RE3: | 5′-TTTCGGcatc | CCGCATgaaact | TTGCGG-3′ |
| Consensus RE1-RE3: | 5′-TTGCGGcatc | CCGCAAgaaact | TTGCGG-3′ |