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Photoisomerization of the protonated Schiff base of 11-cis-retinal chromophore (PSB11) to 11-trans-retinal chromophore (PSBT). Also shown in the background are the PSB11 (black) and PSBT (red) chromophores embedded into the seven-transmembrane (TM7) α-helices of squid rhodopsin (yellow) and bathorhodopsin (green)
