Table 1. Summary of mass determination of CpxR and CpxR∼P by ESI-MS.
| Sample | Experimental mass | Theoretical mass |
| CpxR | 27561±4 | 27560 (unmodified) |
| 27564±3 | ||
| 27556±4 | ||
| CpxR∼P | 27640±3 | 27640 (singularly phosphorylated) |
| 27641±2 |
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