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Viewed from above (A) or beside (B) the plane of pigment B19. The structures are aligned relative to the main ring atoms of chlorophylls B18 and B19. Red atoms/dipoles refer to WT Synechocystis, while blue atoms/dipoles refer to the Red_c mutant. (C) Simulated (red curve) Red_c – WT Synechocystis absorption difference spectra compared with the corresponding experimental spectrum (black curve).
