Figure 3.

Odyssey analysis of organ/muscle cryosections (20 μm) from ZM4-IR multiple-dose administered mice 7 days (a) and 1 month (b) after last treatment. Green fluorescence represents IR-dye signal (~800 nm) associated to the nanoparticle; red represents tissue autofluorescence at ~700 nm. The signal is evident in abdominal lymph nodes, ileum, and masseter muscle at 7 days and absent at 1 month. Hematoxylin-Eosin (HE) staining of the same cryosections is presented next to IR positive sections to clarify the position on the slide.