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AF binds independently to RosA in the presence of SAH. A solution of RosA (25 μm) and SAH (150 μm) was titrated with AF (0–34.0 μm). The absorption spectra of the titrations were recorded from 300 to 700 nm using a UV/Vis spectrophotometer. The inset shows a plot of the absorption change at 495 nm as a function of SAH concentration. A hyperbolic fit to the experimental data yielded a dissociation constant of 10 ± 1 μm.
