The magenta staining of the basement membrane is due to abundant what?

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Multiple Choice

The magenta staining of the basement membrane is due to abundant what?

Explanation:
Carbohydrates. The basement membrane is rich in carbohydrate-containing molecules, especially glycoproteins and proteoglycans with long sugar chains. The periodic acid–Schiff (PAS) reaction oxidizes those sugars to aldehydes, which then react with Schiff reagent to produce a magenta color. That strong magenta staining reflects the abundant carbohydrates, not nucleic acids, lipids, or simply non-glycosylated proteins.

Carbohydrates. The basement membrane is rich in carbohydrate-containing molecules, especially glycoproteins and proteoglycans with long sugar chains. The periodic acid–Schiff (PAS) reaction oxidizes those sugars to aldehydes, which then react with Schiff reagent to produce a magenta color. That strong magenta staining reflects the abundant carbohydrates, not nucleic acids, lipids, or simply non-glycosylated proteins.

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