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UVRR and difference spectra for WT AppA126 and the Q63L, W64F, and Q63L/W64F mutants. (a) UVRR spectra of WT AppA126 in the dark state (dotted line) and the Q63L mutant (solid line). (b) The Q63L mutant − WT AppA126 in the dark state. (c) The Q63L mutant −WT AppA126 in the light state. (d) The Q63L/W64F − W64F mutants in the dark state.
