Description: PI Staining Kit Application : Propidium iodide (PI) has been widely used as a fluorescent stain for DNA in cells; it specificity binds double-stranded nucleic acids in apoptosis, necrosis and fixed cells. PI and DNA complex show light red flourescent color with excitation light 493 nm and emission light 630 nm. It can not throughout the normal living cells membrane, but it enters the apoptosis, necrosis and fixed cells and binds double-stranded DNA.Storage/Stability : Store at -20°C for one year.