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PL spectra of CYFRA 21-1 biomarker detection at different concentrations (A) in 1 μM PBS buffer (1DZnO N1), (B) zoomed-in view from 1DZnO N1, and (C) in artificial saliva (1DZnO N2), (D) zoomed-in view from 1DZnO N2. (E) Antibody immobilization efficiencies obtained after biofunctionalization of N1 and N2 nanoplatforms. ND means nondetectable.
