Fig. 3

DEXs-Gel prolonged the retention time of DEXs in vivo. A and C Near-IR fluorescence images of the body and main organs. B Analysis of maximum flux (a.u.) of body near-IR fluorescence in different groups. D–F Analysis of maximum flux (a.u.) of different organs in terms of near-IR fluorescence in different groups on day 3, day 7 and day 14. n = 3, *p < 0.05, **p < 0.01, ***p < 0.001