immunoelectron microscopy demonstrated : ( 1 ) the presence of hla staining of keratinocyte membranes from the stratum basalis to the level of the upper stratum spinosum and in the pilar infundibulum , ( 2 ) the possible absence of hla on melanocytes , ( 3 ) the presence of focal hla staining of the membranes of epidermal and follicular dendritic cells that contained birbeck granules and were , therefore , langerhans cells , ( 4 ) dendritic mononuclear cells within the follicular epithelium , which although devoid of birbeck granules , exhibited similar reactivity with anti-hla antibody .
C0023005
langerhans cells
C0230694
birbeck granules