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SEM images of biotinylated microspheres with (a) streptavidin-coated UPNBs and (c) bare UPNBs. (b) Scheme for the conjugation of biotinylated microspheres with streptavidin-coated UPNBs. (d) Confocal fluorescence image of a mixture of five types of microsphere-UPNB complexes under 980-nm laser excitation.
