What is the primary nuclear stain for Pap smear?

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Multiple Choice

What is the primary nuclear stain for Pap smear?

Explanation:
Harris hematoxylin is the primary nuclear stain used in Pap smears. It binds to nucleic acids and produces deep blue-black nuclei with sharp chromatin detail, which is essential for evaluating nuclear size, shape, and chromatin patterns that hint at cellular abnormality. After this nuclear staining, cytoplasmic counterstains like OG-6 and EA-50 provide contrast in the cytoplasm to differentiate cell types and maturation, but they are not used to stain the nuclei. The other options are cytoplasmic stains or used in different contexts, so the nuclear stain that best fits Pap staining is Harris hematoxylin.

Harris hematoxylin is the primary nuclear stain used in Pap smears. It binds to nucleic acids and produces deep blue-black nuclei with sharp chromatin detail, which is essential for evaluating nuclear size, shape, and chromatin patterns that hint at cellular abnormality. After this nuclear staining, cytoplasmic counterstains like OG-6 and EA-50 provide contrast in the cytoplasm to differentiate cell types and maturation, but they are not used to stain the nuclei. The other options are cytoplasmic stains or used in different contexts, so the nuclear stain that best fits Pap staining is Harris hematoxylin.

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