| http://www.w3.org/ns/prov#value | - The outer membrane 62 covering the luminal surface of the sensor is preferentially a hydrogel, such as poly(ethylene glycol) (PEG), poly(vinyl alcohol) (PVA), poly(N-vinyl pyrrolidone) (PVP), poly(hydroxy ethylmethacrylate) (PHEMA), or other, in order to further reduce the probablility of cell adhesion to the surface.
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