<prompt> Antigen processing cells are all of the following, except:AstrocytesDendritic cells in lymphoid folliclesReticulum cells of lymph nodesLangerhans cells  <response>: Antigen presenting cells include:Macrophages: APC of bloodModified macrophages:Dendritic reticulum cells in follicles of lymph nodesInterdigitating reticulum cells in the paracoical zone of lymph nodesLangerhans cells: APC of skinAstrocytes do not function as APCref: Robbins 8e p192 