In a PAS staining protocol that uses potassium permanganate as the oxidizing agent, neutral mucins appear in what color?

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Multiple Choice

In a PAS staining protocol that uses potassium permanganate as the oxidizing agent, neutral mucins appear in what color?

Explanation:
In this PAS protocol, the oxidizing step with potassium permanganate alters which mucin components react with Schiff. It tends to oxidize the acidic mucin residues more readily, diminishing their ability to form the aldehyde groups needed for the Schiff reaction and thus reducing the magenta color they would normally produce. Neutral mucins, lacking those easily oxidizable groups, still form aldehyde groups to react with Schiff, but the overall reaction is less intense, giving a pale, light pink color rather than a deep magenta. So neutral mucins appear light pink in this method.

In this PAS protocol, the oxidizing step with potassium permanganate alters which mucin components react with Schiff. It tends to oxidize the acidic mucin residues more readily, diminishing their ability to form the aldehyde groups needed for the Schiff reaction and thus reducing the magenta color they would normally produce. Neutral mucins, lacking those easily oxidizable groups, still form aldehyde groups to react with Schiff, but the overall reaction is less intense, giving a pale, light pink color rather than a deep magenta. So neutral mucins appear light pink in this method.

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