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Heparin coating on the PPy–cellulose membranes stained with avidin–Texas Red observed under fluorescence microscopy. Panels show representative images of (a) heparinized PPy–cellulose, (b) heparinized PPy–cellulose after reduction–oxidation cycles, (c) non-heparinized PPy–cellulose membrane. Note the intense red staining distributed all over the surface of the heparinized samples (a,b). (Online version in colour.)
