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SEM images of gold [A] and Polypyrrole (PPy) doped with chondroitin sulfate (CS) [B], dodecylbenzenesulfonate (DBS) [C] and p-Toluene sulfonate (pTS) [D]. Contact angle test [E] and roughness analysis [F] of the different surfaces. The value represents mean ± standard deviation (n = 3). **p<0.01, v. gold control. The scale bars represent 2 μm.
