Fig. 4

The mice PET/CT imaging showed the antigen retention at injection site and biodistribution in vivo. a Experimental design to evaluate the transport behavior of various vaccines. b The mice SPECT imaging of different ⁸⁹Zr-OVA-loaded formulations. c Half quantitative T/N of antigen retaining at injection sites. T/NT: the ratio of the injection site (T) to the non-injection site (NT) of the radioactive semi-quantitation. d The diagram of internal organs in mice