FIG. 3.

(A) Absorption spectra of chromatophores of the wild type (dashed line) and of the PPSRK mutant (solid line) grown photosynthetically (A) or semiaerobically (B). (The zero level of the upper spectrum in panel A was shifted for better viewing.) (B) In the PPSRK mutant, a shift of the 860-nm peak to 870 nm, a reduction in the absorbance at 804 nm, and an increase in the absorbance at 420 to 550 nm are apparent.