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The hydrogel was immersed in PBS for 24 h at 37 °C to fully swell, and its swelling weight Ws was measured. Then, the hydrogel was lyophilized to obtain dry weight Wd. The swelling degree was calculated as the following equation [30]:
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Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/).
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