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Structure of PCL and photogel polymerization/degradation. a) PCL crosslinking is achieved by radical polymerization using acryl groups. Photogel is degraded by exposure of photolabile o-nitrobenzyl groups to 365 nm UV light. b) Fluorescent confocal microscopy of UV-exposed rhodamine-incorporated photogel shows complete gel degradation with less than 20 µm resolution. Scale bar: 100 µm.
