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Scanning electron micrographs of hydrogels reinforced with silk microfibers. The morphology and microarchitecture of freeze-dried, acellular (A) 4% silk hydrogel, (B) 4% SF–silk hydrogel, (C) 2% agarose hydrogel and (D) 2% SF–agarose hydrogel were visualized by SEM at 200× magnification. Silk microfibers are indicated by arrows. Scale bars are 100 μm. Insert boxes show magnified images of hydrogels. Silk microfibers are indicated by arrows.
