Figure 12 of
Baer, Mol Vis 4:30, 1998.
Figure 12. Binding of all-trans retinol to X4IRBP and the Arg->Gln mutants monitoring quenching of protein fluorescence (excitation 280 nm; emission 340 nm)
Each panel is a separate experiment comparing a single Arg->Gln mutant (open symbol) to that of X4IRBP (filled symbol).