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Nyquist plots for the biosensor with immobilised anti-PSA antibody (Ab), after addition of PSA (+PSA) and after addition of SNA lectin (+SNA). Two different concentrations of PSA of 4 aM (A) or 0.4 nM (B) were incubated with the biosensor device and final in-situ glycoprofiling of PSA´s glycan was done by incubation with SNA lectin.
