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Accumulation of CD11b + cells at the capsule highest for cationic surfaces. Polypropylene particles coated with different surface functionalities were subcutaneously implanted in Balb/C mice. The animals were sacrificed at 2 weeks post implantations. Values shown reflect the average number of CD11b+ cells seen at the capsule for different surface functionalities. Vertical lines denote ±1 SD (n= 4 for –CH2, -NH2, -OH, -CFx and -COOH).
