The Vybrant™ DyeCycle™ Violet/SYTOX™ AADvanced™ apoptosis kit is used for the identification of apoptotic cells. This kit provides a rapid and convenient assay based upon fluorescence analysis of the compacted state of the nuclear chromatin in apoptotic cells. The kit contains solutions of the cell-permeant Vybrant™ DyeCycle™ Violet stain (Ex/Em max ∼370/440nm) which is excited with UV or violet laser and SYTOX™ AADvanced™ (Ex/Em max ∼546/650 nm) which is excited with a 488 nm laser. SYTOX™ AADvanced™ is used to detect changes in permeability of the plasma membrane therefore allowing identification of dead cells. The staining pattern resulting from simultaneous use of both dyes in combination make it possible to distinguish normal, apoptotic, and dead cell populations by flow cytometry.