DAPI (diamidino-2-phenylindole) is a popular blue fluorescent nuclear and chromosome counterstain. It fluoresces brightly upon selectively binding to AT regions in double-stranded DNA. Its selectivity for DNA and high cell membrane permeability allows efficient staining of nuclei with low background from the cytoplasm. DAPI is a classic nuclear counterstain for immunofluorescence microscopy. The excitation and emission wavelengths of DAPI-DNA complex are 360 nm and 460 nm, respectively.Hito DAPI Nuclear Counterstain Solution is ready for use solution for nucleus counterstaining in immunofluorescence experiments and it is a simple solution for your research.20 ml / Dropping bottle