Which of the following is considered a special histological stain used to identify mucin or glycoprotein in tissue sections?
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Correct answer: Periodic acid–Schiff stain
The PAS stain highlights glycogen, mucins, mucoproteins, and glycoproteins in tissues, making it useful to detect mucin-producing cells or basement membranes. Special stains like PAS complement routine H&E when more biochemical detail is needed.
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