EasyProbes??DAPI is a commonly used nuclear counterstain for fixed cells that emits blue fluorescence upon binding to the minor groove of dsDNA. Our EasyProbes? DAPI Fixed 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.?DAPI?is widely used for nuclear and chromosome counterstain, showing a distinct banding pattern in chromosomes.