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. Author manuscript; available in PMC: 2012 Sep 1.
Published in final edited form as: Curr Med Chem. 2011 Sep 1;18(27):4195–4205. doi: 10.2174/092986711797189691

Fig. 1.

Fig. 1

A QD-Apt-Dox conjugate. A. QD-Apt-Dox is initially “off” as the fluorescence of QD is transferred to Dox and the fluorescence of Dox is quenched by the aptamer, both by fluorescence resonance energy transfer. B. Once QD-Apt-Dox is inside cancer cells, Dox is gradually released from the conjugate and the fluorescence of QD is recovered. C. Microscopy images of PSMA-positive cells after incubation with QD-Apt-Dox. QD and Dox are shown in green and red, respectively. Scale bar: 20 µm. Adapted from [33,126].