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Lighting the way: Biochemical cues have been reversibly patterned into hydrogels with full spatiotemporal control by using two photochemical reactions. The hydrogel is conjugated with a peptide by a thiol-ene photoaddition reaction that is initiated by visible light. Subsequent, selective photocleavage of an o-nitrobenzyl ether with UV light enables dynamic presentation of the peptide to cells with control in three dimensions.
DeForest et al. (Thu,) studied this question.