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Probing structural deformations of the pG dark state of wtPYP (black) by the N43A (red) and N43S (green) mutations using second derivative FTIR spectroscopy. The FTIR absorbance spectrum of the three protein samples was measured at 2 cm−1 resolution, and was used to calculate the second derivative to facilitate comparison of spectral features in the three spectra. Selected peak positions are indicated.
