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Silk microtubes at a range of diameters. Stainless steel wire and rods were used to generate silk tubes with approximate inner diameters of (from left to right): 127 μm, 500 μm, 1 mm, 2 mm, 3.2 mm, 4 mm, 5 mm, and 6 mm. This demonstrates that these silk microtubes can be easily generated for any size microvascular graft (<6 mm inner diameter).
