| http://www.w3.org/ns/prov#value | - The device of claim 1 wherein the first porous separating matrix is an asymmetric membrane with a first surface and a second surface, the membrane having a gradient of pore sizes such that the pore size decreases from the first surface to the second surface, the asymmetric membrane capable of trapping the cellular components of blood within it and allowing the liquid components of blood to pass th
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