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(a) Synthesis of R-4C, (b) synthesis of AuNP@MPA-R-4C, (c) synthesis of AuNP@MPA-R-4C-X. (R = l-tryptophan (l-Trp), l-lysine (l-Lys), l-cysteine (l-Cys), and l-glutamic (l-Glu) residues; X = FITC or BODIPY).
