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(a) Disulfide formation for crosslinking; (b) 3% hydrogel, 6% hydrogel and 10% hydrogel show the crosslinking network changes; (c) cumulative release profiles of hydrogels; degraded hydrogel on fetal membrane; (d,e) no signs of transfer inside the fetal membrane; (f) adapted with permission from [31], Copyright © 2011 American Chemical Society.
