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(A) Appearance of solutions for making ECM-SIS hydrogel and pure collagen hydrogel prior to gelation. (B) Appearance of SIS hydrogel and pure collagen hydrogel after gelation. (C). Electron micrograph of SIS hydrogel. (D) Electron micrograph of pure collagen hydrogel showing fibre morphology. ECM = extracellular matrix; SIS = small intestine submucosa.
