Figure 4.

EPR data for the reaction between myoglobin microcrystals and 114 mM azide. EPR intensities are shown in relative units. (a) EPR spectra of the high- and low-spin crystal standards. (b) Time-resolved EPR spectra of the myoglobin/azide reaction normalized for myoglobin concentration (see the Supporting Information). The spectra for timepoints with duplicate measurements are averaged. (c) Percent of the initial state remaining as a function of time for the reaction in microcrystals (circles) and solution at the same azide concentration for comparison (black triangle). The 2× label indicates two overlapping datapoints at 250 ms.