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Periodic acid–Schiff–diastase (PAS-D, PAS diastase) stain is a periodic acid–Schiff (PAS) stain used in combination with diastase, an enzyme that breaks down glycogen. PAS-D is a stain often used by pathologists as an ancillary study in making a histologic diagnosis on paraffin-embedded tissue specimens. PAS stain typically gives a magenta color in the presence of glycogen. When PAS and diastase a... Wikipedia