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Summary of different fragments produced by spa33 and their role in T3SS
| Name of the fragment | Mechanism of production | Molecular weight (in kDa) | Role in T3SS |
|---|---|---|---|
| Spa33FL | Full length protein | 33.4 | Required |
| Spa33C | Internal start codon (V192) | 11.6 | Required |
| Spa33CC | Internal start codon (M237) | 6.5 | Required |
| Spa33N | Transcriptional slippage site in spa33 (180−189p) | 11.5 | Not required (in vitro) |
| Spa33x | Unknown | ~10 | Unknown |
