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a) Ratiometric fluorescence emission spectra of a 5 μm AP 1 and 50 μm CB[8] mixture upon addition of TrpOMe (0–55 μm) (λ ex=340 nm) in 10 mm HEPES buffer, pH 7.4. b) Ratiometric fluorescent responses of a 5 μm AP 1 and 50 μm CB[8] mixture upon addition of different tryptophan derivatives (0–55 μm) (λ ex=340 nm) in 10 mm HEPES buffer, pH 7.4.
