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(a) The main Qy absorption of the LH1-only membranes (solid line) and the RC-only membranes (dashed line) at 77 K; the latter were frozen in the dark. P is the special pair, B the accessory BChls, and H the BPheos. The absorption of the RC complexes is enhanced for ease of comparison. (b) The LD spectra of these membranes at 77 K in the same spectral region.
