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Atomic-force microscopy of a PAA-BP/anti-knob antibody- (A) and D1- (B) derivatized stainless steel surface exposed to an Ad suspension (5 × 1010 particles per ml), demonstrating distribution of viral particles on the PAA-BP-activated surfaces. (C) For comparison, a control is shown consisting of a stainless steel surface exposed to only PAA-BP. (Scale bar, 1 μm and a depth scale of 500 nm is shown.)
