Fig 5.

Absorbance spectra for supernatants of wild-type (solid line), Δsll1951 (dotted line), and Δsll1213 (dashed line) cultures that had been grown photomixotrophically to high density (OD₇₃₀, >4). Supernatants of Δsll1213 and Δsll1951 cultures were diluted 1:5 and 1:2, respectively. Spectra were taken after filtration through a 0.2-μm-pore-size filter.