Fig. 5. Representative in vivo long-term NIR-II fluorescence images (808 nm excitation, 90 mW cm^–2, 1000 nm LP, 100 ms, n = 3) of the 4T1 breast tumor model at different time points after tail vein injection of the HLZ-BTED dots (0.2 mL, 10 mg kg^–1). The white circles indicate the location of the 4T1 tumor. Scale bar: 1 cm.