| http://www.w3.org/ns/prov#value | - In a further embodiment, an external surface of first sheet 504 may be textured with features, such as undulations, raised regions or ridges and/or recessed regions or valleys, having suitable dimensions including a height, a width and/or a length, ranging from about 10 nm to about 100 ??m such that properties of blood flow at or near the external surface of first sheet 504 are modified.
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