| Hb | Human hemoglobin |
| HbI | Homodimeric hemoglobin from Scapharca inaequivalvis |
| R state | Relaxed state |
| T state | Tense state |
| WT | Wild-type |
| T72 | Thr72 |
| F97 | Phe97 |
| TRXSS | Time-resolved X-ray solution scattering |
| TRXL | time-resolved X-ray liquidography |
| XFEL | X-ray free-electron laser |
| RMSD | Root-mean square deviation |
| TA | Transient absorption |
| SVD | Singular value decomposition |
| PCA | Principle component analysis |
| F97Y HbI | HbI mutant construct of Phe97 to Tyr |
| T72V HbI | HbI mutant construct of Thr72 to Val |
| I3WT | I3 intermediate for wild-type HbI |
| I3F97Y | I3 intermediate for F97Y HbI |
| I3WT | I3 intermediate for T72V HbI |
| cryo-EM | Cryo-electron microscopy |
| NMR | Nuclear magnetic resonance |
| MD | Molecular dynamics |
| TG | Transient grating |
| HbI(CO)2 | HbI ligated with CO ligands |
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