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(a) Photograph showing the genipin-crosslinked hydrogel (GH) and poly(3,4-ethylenedioxythiophene):poly(4-styrenesulfonate) (PEDOT:PSS)-containing gelatin hydrogels (PGHs) with different mixing ratios of gelatin and PEDOT:PSS. (b–e) Cross-sectional SEM images of freeze-dried hydrogels: (b) GH, (c) PEDOT:PSS-incorporated gelatin hydrogel (PGH)0.01, (d) PGH0.05, and (e) PGH0.1. Scale bars = 100 μm.
