Fig. 7

Biodistribution and circulation of different nanoparticles in vivo. A Biodistribution of nanoparticles in vivo. B Ex-vivo images of the major organs. C The quantitative analysis of the fluorescence in the major organs and tumors. D Circulation lifetime of nanoparticles. *, P < 0.05; **, P < 0.01; ***, P < 0.001