PAS Stain Kit is used to identify glycogen in tissue sections on the Artisan Link and Artisan Link Pro Staining Systems. PAS-positive entities and structures are also numerous in tissue sections. The most common application is for demonstrating glycogen in the liver. Duplicate sections are stained with or without a pre-treatment, such as the Artisan Alpha-Amylase (Code AR171), which is a glycogen-digesting enzyme. Comparing PAS signal intensity in a digested tissue sample with one that has not been digested will give an indication of the amount of glycogen present. A loss of glycogen may be indicative of a metabolic disorder or damage to the liver. Positive glycogen: magenta, nuclei: blue and the background: pink.