Journal Article Research Support, Non-U.S. Gov't Review Adjuvants, Immunologic Antigens Contrast Media Coordination Complexes CpG Drug Carriers Fe3O4 nanoparticle Fluorescent Dyes MRI Magnetite Nanoparticles PEG ligand Peptides anchoring group cancer imaging cancer immunotherapy contrast enhancement effect fluorescence in vivo applications iron oxide nanoparticles magnetic resonance imaging membrane fusion multimodal imaging probes nanovaccines near-infrared optical imaging quantum dots semiconductor quantum dots