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Chemical structure of DAPI (top) a fluorescent stain used to stain nuclei. Bottom left, bovine caruncular epithelial cell line (BCEC) stained with DAPI and showing blue nuclei. Bottom right, BCEC infected with bovine viral diarrhea virus (BVDV) showing cell nuclei stained with DAPI and fluorescence cy3-conjugated antibody to detect BVDV (red).
