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A microscopy staining method that utilizes Schiff\'s reagent, a solution composed of pararosanilin treated with sulfurous acid, which selectively reacts with and stains aldehydes pink to determine the presence of glycogen, mucin, mucoprotein, glycoprotein, as well as fungi. Periodic Acid Schiff staining is useful for outlining tissue structures such as basement membranes, capsules and blood vessels.
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