<prompt> All of the following compounds are mitogens that stimulate human T cells to proliferate, EXCEPT:LipopolysaccharideConcanavalin AAnti CD3 antibodyPhytohemagglutinin  <response>: All of the listed compounds are T-cell mitogens except lipopolysaccharide, which is a B-cell mitogen. Ref: Harrisons Principles of Internal Medicine, 17th Edition, Chapter 310, Page 2055 