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Europium-doped GdPO4 hollow spheres/polymer core-shell nanoparticles are functionalized with ovalbumin (OVA) as a model antigen and an oligonucleotide (CpG) that stimulates the immune response. These functionalized core-shell nanoparticles are used as vaccines, where they enable efficient delivery of an antigen to target sites, tracking of the vaccines using non-invasive clinical imaging technology.
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Li et al. (2013) studied this question.
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