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Difference between the conductance after and before streptavidin binding, divided by the conductance before binding of 10 µM streptavidin using 1 h incubation. The signal change is independent on the numbers of nanochannels. For the control measurement the channels were coated with PLL-g-PEG (no biotin), whereas all other chips were pretreated with PLL-g-PEGbiotin.
