Which staining reagent is commonly used to visualize nuclei in standard histology procedures?

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Multiple Choice

Which staining reagent is commonly used to visualize nuclei in standard histology procedures?

Explanation:
Nuclei are made visible by a basic dye that binds to the acidic components of the nucleus (DNA and RNA). Hematoxylin, especially in the Harris formulation, binds to these nuclear materials (via a mordant to form the hematein complex) and stains them a blue-to-purple color. This strong nuclear contrast against the eosin-stained cytoplasm is what makes the nuclei stand out in routine histology slides. The other stains target different structures: eosin colors cytoplasm and extracellular matrix pink, crystal violet is used mainly in Gram staining of microbes, and Safranin O is used as a counterstain in various protocols or for specific tissues—not for standard nuclear visualization.

Nuclei are made visible by a basic dye that binds to the acidic components of the nucleus (DNA and RNA). Hematoxylin, especially in the Harris formulation, binds to these nuclear materials (via a mordant to form the hematein complex) and stains them a blue-to-purple color. This strong nuclear contrast against the eosin-stained cytoplasm is what makes the nuclei stand out in routine histology slides. The other stains target different structures: eosin colors cytoplasm and extracellular matrix pink, crystal violet is used mainly in Gram staining of microbes, and Safranin O is used as a counterstain in various protocols or for specific tissues—not for standard nuclear visualization.

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