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DAPI staining is a fluorescent staining technique that uses the dye 4′,6‑diamidino‑2‑phenylindole (DAPI) to bind strongly to DNA’s A‑T rich regions and emit bright blue fluorescence under ultraviolet light, making it widely used to visualize cell nuclei in fluorescence microscopy for cell counting, nuclear morphology analysis, and as a counterstain in multicolor imaging.https://www.betalifesci.com/blogs/news/dapi-staining