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| Protein preparation | CT50(ng/mL)±SEM | P* |
|---|---|---|
| Wild type rETX | 37.73±12.55 | - |
| mETXH106P | NT | 0.0023 |
| mETXS111Y | 69.06±22.60 | 0.0094 |
| mETXS111H | 95.54±1.67 | 0.2435 |
| mETXF199E | 97060±5790 | 0.0002 |
| mETXF199H | 1280±220 | 0.1707 |
| mETXS111YF199E | 37090±1440 | 0.0159 |
NT, not toxic; *, each mETX compared with wild type rETX
