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. 2024 Aug 13;7:180. doi: 10.1038/s42004-024-01256-6

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© The Author(s) 2024

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Fig. 9 — PS 21 is photoactive but lacks fluorescence emission. However, a cysteine nucleophilic attack against the sulfide bond leads to the formation of two fluorescent probes: naphthalimide-thioether and cyanine-thioether (λ_abs/λ_em 660/750 nm). λ_abs, absorption wavelength; λ_em, emission wavelength.