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(a) Preparation of SERS-encoded conjugates (“nanotags”). Normalized optical spectra of plain nanostars (GNS; yellow), after encoding with Raman reporter (GNS–Rep; pink), after antibody conjugation (GNS–Rep–Ab; blue) and after PEG backfill addition (GNS–Rep–Ab–PEG; green) for (b) BPE, (c) MBA, (d) DCT, (e) PCTP, and (f) DTNB.
