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(A) Fluorescence emission spectra of AuNP@FITC for different concentrations of PD-L1, CPD-L1 [nM]: (1) 0, (2) 1.27, (3) 3.17, (4) 6.3, (5) 12.7, (6) 25.3, (7) 38, (8) 51, (9) 63.0. (B) The dependence of IFL vs. CPD-L1, CFITC = 66.7 nM, CAuNP@Cit = 2.02 nM, CPD-L1 = 0–63 nM, λex = 495 nm.
