Fig. 6
A In vivo imaging of the mice after free DiD, DiD NPs and MM@DiD NPs injection at 24 h. B Ex vivo organ imaging of mice and C quantitative fluorescence intensity of the main organs in ex vivo organs (n = 3, mean ± SD, ** p < 0.01). D Blood fluorescence images of free DiD, DiD NPs and MM@DiD NPs over a span of 48 h after injection, and E corresponding fluorescence intensity (n = 3, mean ± SD)