<prompt> The stain used for demonstrating Auer rods in blasts is -Periodic Acid SchiffPASMyeloperoxidaseLeucocyte alkaline phosphataseNon-specific esterase  <response>: The cytochemical stain, Myeloperoxidase is positive in immature myeloid cells containing granules and Auer rods Reference textbook of Pathology 7th edition author Harsha Mohan page number 342 