<prompt> Antigen presenting cells areLangerhans cellsMacrophagesCytotoxic T cellsHelper T cells  <response>: Ref Robbins 7e p197 ;9e p210 , macrophages and B lymphocytes is also the answer Professional antigen presenting cellsAPCs are immune cells that specialize in presentingan antigen to a T-cell. The main types of professional APCs are dendritic cells DC, macrophages, and Bcells, Langerhans cells 