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(a) UV-Vis spectra of 2 cross-linked to the peptide AB15: (—) dark-adapted, (---) with red light irradiation. (pH 7.5, 22°C) (b) photoisomerization under red light (indicated by the red bar) followed by thermal recovery in the dark (black bar). (c) Multiple photoswitching cycles show no evidence of photobleaching (pH 7.5, 22°C).
