Time-resolved low-frequency RR spectra obtained after mixing ferrous OxdA (final concentration, 5 μM) with butyraldoxime (final concentration, 200 mM). The spectra were obtained at (a)5,(b) 10, (c) 15, (d) 20, (e) 25, (f) 30, (g) 35, and (h) 40 min, respectively.