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(A) FE-SEM images of the collagen hydrogel structures with different concentration of collagen (Scale bar: 100 μm) and OE-MSCs encapsulated in different concentration of collagen hydrogel (Scale bar: 10 μm); (B) The porosity percentage of collagen hydrogel scaffolds in different collagen concentrations, including 4 mg/mL, 5 mg/mL, 6 mg/mL, and 7 mg/mL.
