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Revised photocycle of ChR2. ChR2470 has an all‐trans,15‐anti chromophore and illumination results in the 13‐cis,15‐anti P1 500 state. The deprotonated P2a 390, P2b 390 and open channel P3 520 states follow but no trapping protocol exists for these states. A 13‐cis,15‐syn chromophore is observed in the desensitized P4 480 state which is populated after channel closure. P4 480 itself is photoactive and we term its photo product Px. Px contains a twisted chromophore structure.
