Keywords: Antigen presentation alt.svg en Antigen presentation stimulates T cells to become either cytotoxic CD8+ cells or helper CD4+ cells Cytotoxic cells directly attack other cells carrying certain foreign or abnormal molecules on their surfaces Helper T cells or Th cells coordinate immune responses by communicating with other cells In most cases T cells only recognize an antigen if it is carried on the surface of a cell by one of the body ™s own MHC or major histocompatibility complex molecules 100px<br/>http //www niaid nih gov/publications/immune/the_immune_system pdf The Immune System pdf Fred the Oyster<br/> v 2014-10-20 PD-USGov DO11 10 GFDL cc-by-sa-all redundant Antigen presentation Images created by Fred the Oyster SVG diagrams Cell diagrams |