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(a) Position of bacteriochlorophylls (PM, PL, BM, BL) and bacteriopheophytins (HM, HL) in the reaction center (RC) from Rhodobacter sphaeroides. (b) RC equilibrium infrared absorption spectrum from Ref. 5. (c) Light harvesting complex 1 surrounding the RC; shown is also the B875 ring of pigments. (d) Orientation of bacteriochlorophyll and bacteriopheophytin transition dipole moments in the RC.
