In PIN 4 Cocktail, p63 is located in which cellular compartment?

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Multiple Choice

In PIN 4 Cocktail, p63 is located in which cellular compartment?

Explanation:
The main concept is where p63 resides in the cell. p63 is a nuclear transcription factor expressed in the basal cells of prostatic glands, so in the PIN4 cocktail its staining is confined to the nucleus. This nuclear localization is what lets pathologists identify the basal cell layer: benign glands have a continuous basal layer with p63-positive nuclei, while adenocarcinoma typically lacks this basal layer. So p63 staining in PIN4 is nuclear, not cytoplasmic, mitochondrial, or extracellular.

The main concept is where p63 resides in the cell. p63 is a nuclear transcription factor expressed in the basal cells of prostatic glands, so in the PIN4 cocktail its staining is confined to the nucleus. This nuclear localization is what lets pathologists identify the basal cell layer: benign glands have a continuous basal layer with p63-positive nuclei, while adenocarcinoma typically lacks this basal layer. So p63 staining in PIN4 is nuclear, not cytoplasmic, mitochondrial, or extracellular.

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