<prompt> Answer this question truthfullyWhat is diastase and how can it be used to demonstrate glycogen deposits in tissue samples?  <response>: <reason> Diastase is an enzyme that breaks down glycogen. It can be used in conjunction with PAS Periodic Acid-Schiff staining to demonstrate glycogen deposits in tissue samples. The diastase breaks down the glycogen, leaving behind a clear area that can be visualized under a microscope. 