In a PAS (Periodic Acid-Schiff) stain of the small intestine, which part of the simple columnar epithelium stains most intensely?
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Correct answer: The glycocalyx and goblet cell mucin
PAS stains complex carbohydrates. The mucin stored in goblet cells and the carbohydrate-rich glycocalyx covering the microvilli of the brush border will stain bright magenta.
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