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SEM micrographs of PVA/collagen blend films doped with different concentrations of B1: (a) PVA(2%), (b) PVA(2%)/collagen(2%), (c) PVA/collagen/B1(0.25%), (d) PVA/collagen/B1(0.5%), (e) PVA/collagen/B1(1%), (f) PVA/collagen/B1(2%), and (g) PVA/collagen/B1(4%).
