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Photo‐triggered on/off fluorescence of spiropyran‐labelled encapsulin: a) UV/Vis spectra showing the characteristic absorption band of merocyanine at λ=540 nm. b) Reversible photo‐switching of spiropyran to merocyanine monitored at λ=540 nm. c) Emission spectra showing the fluorescence of merocyanine at λ=615 nm upon excitation at λ=535 nm. d) Reversible conversion of on‐state merocyanine to off‐state spiropyran monitored at λ=615 nm.
