<prompt> CD marker of histiocytosisis:CD 1aCD 1bCD 1cCD 1d  <response>: a. CD 1 aRef: Nelsons 20e p 2484-2489, Ghai 8e p 620-623Immunohistochemistry shows: CD1a, S-100 or Langerin CD 207 in Histiocytosis. 