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Dimensions of the collagen prototype grafts. (a) The single-layer knitted collagen graft (COL-K); (b) the bilayer collagen graft with the electrospun layer on the outer surface of the knitted layer; (c) the bilayer knitted and electrospun collagen graft (COL-KE). (A) Wall thickness of the prototype grafts; (B) Outer and inner diameter of the grafts; (C) pore size of the grafts.
