DiI (E4783-GRP)

DiI (DiIC18(3)) is a lipid-soluble fluorescent dye that traces neuronal pathways through retrograde and anterograde transport in neurons. It labels cell bodies, axons, dendrites, and dendritic spines, offering high brightness, slow fading, and long-lasting persistence without leakage. It is employed to investigate brain connectivity, including in postmortem human brain tissue.