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The bacteriochlorophyll special pair (green, PLPM) in the photosynthetic reaction center of R. sphaeroides (Protein Data Bank 1AIJ) has oppositely polarized excited singlet and triplet states. The initially prepared singlet excited state undergoes U-turn ET to the monomeric bacteriochlorophyll (blue, BL) down the l branch to maximize the yield of singlet ET products (1D+A−) and avoid formation of the deleterious donor-localized triplet state (3P*A).
