Fig. 6

In vivo fluorescence imaging of tumor-bearing mice. a In vivo imaging of mice in PBS, DOX, O-CS-DOX NDs and CS-DOX NDs group at different time points (n = 5). b Comparison of average luminescence intensity of tumors-bearing mice between different groups during the experiment. c The luminescence intensity of tumors-bearing mice at the certain time between different groups during the experiments. Asterisks (*) denote significant differences (**p < 0.01, ***p < 0.001)