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The bacterial photosynthetic reaction center (RC) contains two bacteriopheophytin (BPh) molecules, only one of which (characterized by Q x,y maxima at 540 and 760 nm) has been found to function in the normal photochemistry. We present here the formation of a new RC redox state, in which the apparently inactive BPh (Q x,y maxima at 530 and 752 nm) is selectively...
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