Fig. 2From: Synergistic effect of chitosan-alginate composite hydrogel enriched with ascorbic acid and alpha-tocopherol under hypoxic conditions on the behavior of mesenchymal stem cells for wound healingSEM images of hydrogels: a1–a5 CA hydrogel, b1–b5 CA/AA hydrogel, c1–c5 CA/TP hydrogel, d1–d5 CA/AA/TP hydrogel, with magnification 100, 50, 20, and 5 µm. a5, b5, c5, and d5 show the pore sizes of CA, CA/AA, CA/TP, and CA/AA/TP hydrogels, respectivelyBack to article page