FIG. 3.

(A) Absorption spectrum of intact cells showing carotenoid and Bchl peaks. Inset, enlarged 650- to 950-nm region of the spectrum showing the presence of the photosynthetic RC (small peak at 800 nm) and LHI (major peak at 867 nm). (B) Absorption spectrum of sucrose gradient fraction of detergent-solubilized membranes enriched in the LHI-RC complex.