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Quartz crystal microbalance measurements: (a) mass change Δm versus time of gold covered quartz crystals incubated with aptamer/6-mercapto-1-hexanol (MCH) (violet solid line) or MCH (orange dashed line) and subsequently blocked with 1 mM MCH; (b) Δm versus time of an aptamer-modified crystal incubated with different concentrations of protein A.
