Which substance does Alcian Blue stain demonstrate?

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Multiple Choice

Which substance does Alcian Blue stain demonstrate?

Explanation:
Alcian Blue highlights acidic mucins because it is a cationic dye that binds to the negatively charged groups (sulfate and carboxyl) on glycosaminoglycans in mucins. When stained at around pH 2.5, it stains sulfated and carboxylated mucins blue, making acid mucins distinguishable from neutral mucins, which lack those acidic groups. This contrast is often used, sometimes paired with PAS, to differentiate acidic from neutral mucins. The other substances require different stains: amyloid with Congo red, melanin with Masson-Fontana, and reticulin fibers with silver-based stains.

Alcian Blue highlights acidic mucins because it is a cationic dye that binds to the negatively charged groups (sulfate and carboxyl) on glycosaminoglycans in mucins. When stained at around pH 2.5, it stains sulfated and carboxylated mucins blue, making acid mucins distinguishable from neutral mucins, which lack those acidic groups. This contrast is often used, sometimes paired with PAS, to differentiate acidic from neutral mucins. The other substances require different stains: amyloid with Congo red, melanin with Masson-Fontana, and reticulin fibers with silver-based stains.

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