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Schematic model showing the proposed protonation of the ground state, P1 and P2380 intermediates in CaChR1 along with proposed proton transfers. The large green arrow indicates the photon absorption by the unphotolyzed CaChR1. The smaller arrows indicate proton transfers that occur during the CaChR1 → P1 light-driven transition (green) and P1 → P2380 thermal transition (red).
