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(A) Unmagnified view of the hydrogel matrices. (B) Electron microscopy of the hydrogel matrix, (1000×). Most of the groups (PVA/COLII,92.5:7.5, PVA/COLII,95:5, PVA/COLII,97.5:2.5, PVA) all showed loose porosity in their respective microscopic morphology features; no obvious porous structure was observed in group PVA/COLII,90:10.
