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15Nζ-13C15-13Cx correlation spectra that trace the connectivity of resonances in the retinylidene chromophore of bR in the dark-adapted state (A), the light-adapted state (B), the K state with residual bR568 (C), the L states with residual bR568 (D), and the Mo state with its deprotonated SB (E). Conditions are as specified for Fig. 2.
