<prompt> Birbecks granules in the cytoplasm are seen inLangerhans cellsMast cellMyelocytesThrombocytes  <response>: ref Robbins 9e p622 Birbeck granules, also known as Birbeck bodies, are rod shaped or tennis-racket cytoplasmic organelles with a central linear density and a striated appearance. First described in 1961 where they were simply termed characteristic granules, they are solely found in Langerhans cells. 