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(A) Photographs of thiol-ene hydrogels formed by visible light-mediated, eosin-Y initiated thiol-ene photopolymerizations before (left) and after (right) swelling for 48 hours (eosin-Y concentration from left to right: 0.1, 0.5, 1.0, 1.5, 2.0 mM). (B) Effect of eosin-Y concentration on its retention in thiol-ene hydrogels. (PEG4NB: 10 wt%; N = 3; Mean ± S.D.)
