EasyProbes??Propidium iodide is a commonly used dead-cell stain that emits red fluorescence upon binding to?DNA. Our EasyProbes? Propidium Iodide Dead Cell Stain is formulated?in a?ready-to-use solution that is provided in a convenient-to-use dropper bottle. Just tip and drip two drops per ml to stain your cells.?Propidium iodide is membrane-impermeant and excluded from viable cells. It is therefore commonly used for identifying dead cells in a population, and?for counting dead cells, measuring apoptosis, and sorting cells based on DNA content.