Dilinoleyl DiI (1,1'-dilinoleyl-3,3,3',3'-tetramethylindocarbocynanine perchlorate), also known as FAST DiI, has identical absorption and emission spectra as DiI . Due to its unsaturated hydrocarbon chains, dilinoleyl DiI has a much faster lateral diffusion rate in cell membranes than DiI . This property makes dilinoleyl DiI particularly useful for tracing neurons in tissues.    &lamba;Ex/&lamba;Em (MeOH) = 549/565 nm  ε = 148,000  Dark red oily paste soluble in ethanol, DMF or DMSO  Store at -20°C and protect from light  C59H89ClN2O4  MW: 925.82      Fast DiI is a trademark of Molecular Probes.