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Aptamers conjugated with quantum dots (QDs) bind to target molecules on the cellular membrane of cancer cells. QDs with a carboxyl terminal are conjugated with three types of tumor-targeting aptamer (see picture). Various types of cancer cell are simultaneously targeted with QD-TTA1 (605nm, light green), QD-AS1411 (655nm, red), and QD-MUC-1 (705nm, violet).
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Kang et al. (2009) studied this question.
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