<prompt> Birbecks granules in the cytoplasm are seen in:Langerhans cellsMast cellsMyelocytesThrombocytes  <response>: Birbeck granules are rod ShapedTennis-racket shaped cytoplasmic organelles with a central linear density and a striated appearance.They are diagnostic microscopic feature in Langerhans cell histiocytosis Histiocytosis X 