What color does glycogen display in a positive PAS stain?

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Multiple Choice

What color does glycogen display in a positive PAS stain?

Explanation:
Periodic acid–Schiff staining detects glycogen by oxidizing its carbohydrate chains to form aldehyde groups, which then react with Schiff reagent to yield a magenta to bright rose red color in the cytoplasm. That is why glycogen shows up as bright rose red when PAS-positive. The blue seen in many slides typically comes from a hematoxylin counterstain highlighting nuclei, not the PAS reaction. Green or orange are not characteristic PAS colors for glycogen.

Periodic acid–Schiff staining detects glycogen by oxidizing its carbohydrate chains to form aldehyde groups, which then react with Schiff reagent to yield a magenta to bright rose red color in the cytoplasm. That is why glycogen shows up as bright rose red when PAS-positive. The blue seen in many slides typically comes from a hematoxylin counterstain highlighting nuclei, not the PAS reaction. Green or orange are not characteristic PAS colors for glycogen.

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