<prompt> Birbeck granules are present inMerkel cellsLangerhans cellsLanghans cellsMelanocytes  <response>: Ref Robbins 9e p662 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. 