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Representative scanning electron micrographs of PPy–cellulose membranes after 60 min incubation with whole blood (soluble heparin concentration 1.5 IU ml−1). The heparinized composites (before and after reduction–oxidation cycles, (a) and (b), respectively), showed minimal cell adhesion on the surfaces, while the non-heparinized composite presented a large number of adherent platelets and a mesh of fibrils (c).
