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Microstructures of prepared collagen membranes. (A) SEM images of lateral view. (B) Low-magnification SEM images of surface (C) High-magnification SEM images of surface (the arrows represent the cross-band structure of collagen fibrils). Corresponding (D) fibril diameter distributions and (E) fibril orientation distributions of 30, 60, 90, and 120 WCM.
