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(a) Mechanical resistance of hydrogels formed by the thio-ester (green) bond; (b) mechanical resistance of hydrogels formed by the amide (pink) bond; (c) degradation of the hydrogels in the solution of l-cysteine methyl ester. From [39], Copyright © 2013 by John Wiley & Sons, Inc. Reprinted by permission of John Wiley & Sons, Inc.
