Fig. 1. (a and b) Crystal structure of Pr (a) and Pfr (b) structure for the DrBph photo-sensory module (PSM) in the Pfr form. The chromophore (represented in green) is also reported in the inset to change in the dihedral angles in the Pfr form. (c) Chemical structure of the BV chromophore and main atoms numbering. (d) Measured absorption and CD spectra of the two forms.
