Fig. 7. (A and B) Representative non-invasive NIR-II fluorescence images (1250 nm LP, 200 ms, 808 nm excitation, 180 mW cm^–2) of the gastrointestinal tract (GI tract) in BALB/c mice gavaged with the HLZ-BTED dots (0.1 mL, 5 mg kg^–1) for real-time monitoring of gastrointestinal peristalsis of normal mice (A) and mice anesthetized (B) using pentobarbital sodium (n = 3 mice). The white arrow indicates the feces of mice (Fig. 7A, 600 min). Scale bar: 1 cm.