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Various designs of multimodal QD probes. ab Quantum dots having different molecules for target-specific interaction, and, attached to the surface, paramagnetic lipids, and chelators for nuclear-spin labeling. c The silica sphere has QDs and paramagnetic nanoparticles inside and target-specific groups attached to the outside. d The structure of a multimodal QD probe, based on silica-shelled single-QD micelles [40]
