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Most commonly used classes of photolabile moieties for the photodegradation or photoconjugation of light-sensitive hydrogels in the field of tissue engineering (and the single-photon wavelengths required for degradation): (A) O-nitrobenzyl ether (365 nm and derivates up to 480 nm), (B) coumarin derivates (320–500 nm), (C) allyl disulfides (365 nm), and (D) ruthenium(II) polypyridyl complexes (400–500 nm).
