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It goes both ways: A thiol‐reactive cross‐linker based on a bridged azobenzene derivative permits photoreversible control of peptide conformation on irradiation with violet (407 nm) and green (500–550 nm) light (see picture) through isomerization of the cross‐linker. The large separation of the absorbance bands of the cis (yellow) and trans (red) isomers enables complete bidirectional photoswitching.
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