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Mean fluorescence lifetimes for spectrin tryptophans, NATA and PRODAN
| System | Mean fluorescence lifetime (ns) |
| Spectrin (native) | 3.42 |
| Spectrin (denatured) | 4.26 |
| NATA (water) | 3.00 |
| NATA (8 M Urca) | 4.03 |
| PRODAN (water) | 1.54 |
| PRODAN (bound to spectrin) | 5.71 |
Mean fluorescence lifetimes were calculated using equation 6.
