Fig. 4

Whole-body fluorescence images of mice at different time points after being treated with free-form Cy7 and Cy7@BA-Al NPs via oral administration (a); Fluorescence images of in vitro intestine at different time points after mice being treated with free-form Cy7 and Cy7@BA-Al NPs via oral administration (b); Flow cytometric analysis and quantitative results of in vitro intestine at different time points after mice being treated with free-form Cy7 and Cy7@BA-Al NPs via oral administration, (n = 3, error bars = SD). ** = p < 0.01 (c); Fluorescence images of organs at different time points after mice being treated with free-form Cy7 and Cy7@BA-Al NPs via oral administration (d)