. . "Affinity sites contemplated in the practice of the present invention include such functional groups as hydroxyl, carboxyl, carboxylic acid, amine groups, hydrophobic groups, inclusion moieties (e.g., cyclodextrin, complexing agents), biomolecules (e.g. antibodies, haptens, saccharides, peptides) and the like, that promote physical and/or chemical interaction with the bioactive agent or tissue." . .