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Schematic representation of electrosensitive drug delivery coating. Illustration of the chemical structure of the PPy coating containing sodium p-toluenesulfate (SPTS) and biotin as the primary and secondary doping agents. Streptavidin, with four potential binding sites, covalently binds to the biotin incorporated in the PPy-coating at one site and up to three biotinylated growth factors at the other sites, to function as the drug-complex carrier.
