Identification of structural rearrangements around the FMN occurring during the relaxation process. Fourier difference map calculated between R35′′ and a dataset for the PS equilibrium. Positive and negative peaks are displayed as blue and dark pink meshes, respectively. The L-state (green) and D′′-state (firebrick) models are displayed as ribbons and sticks. Alternate orientations for key residues are shown as insets.