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SEM micrographs of 90%PVA/10%HPC hydrogels with different content of BSA (%): (a) 0; (b) 10; (c) 30; (d,e) 50; (f) 90 (magnitude 1000×). The hydrogels were obtained from the solution after applying (a–d) 3 or (e,f) 8 freezing/thawing cycles. (Adapted with permission from Ref. [40]. Copyright 2022, Elsevier Ltd.).
