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Schematic representation of functionalized aptamer-quantum dot (Apt-QD) probe. A group of biotinylated aptamers (biotinylated-Apt) that target a cancer cell are conjugated with streptavidin-quantum dot (Streptavidin-QD) via biotin-streptavidin-specific interaction. When Apt-QDs recognize the cancer cell, the fluorescence emission spectra of QDs is observed.
