FAST DiI is an unsaturated analog of DiI (DiIC18(3)) that reportedly migrates ~50% faster. It is weakly fluorescent in water but highly fluorescent and quite photostable when incorporated into membranes. It has an extremely high extinction coefficient and short excited-state lifetimes (~1 nanosecond) in lipid environments. Once applied to cells, the dye diffuses laterally within the plasma membrane.
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For Research Use Only. Not for use in diagnostic procedures.