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periodic acid-Schiff

   Also found in: Acronyms, Wikipedia 0.01 sec.
per·i·od·ic acid-Schiff (pûr-dk)
adj. Abbr. PAS
Of, relating to, or being a reaction that tests for polysaccharides and related substances through the treatment of tissue sections with periodic acid stain and Schiff's reagent.


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Duodenal biopsy specimens were negative by periodic acid-Schiff staining, specific immunohistochemical analysis, and PCR.
However, to highlight the fungal wall, staining with periodic acid-Schiff (PAS) (figure 3, B) or Gomori methenamine silver (GMS) will result in a dramatic bright magenta (PAS) or black (GMS).
The cytoplasm of the atypical cells was stained with periodic acid-Schiff stain, confirming the diagnosis of extramammary Paget disease.
 
 
 
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