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Dendritic cell. Computer artwork of a dendritic cell presenting a peptide (yellow). Dendritic cells are a type of white blood cell known as antigen presenting cells (APCs). They play a role in the body's immune system by recognising and phagocytosing (engulfing and destroying) pathogens. They then present the digested parts (antigens) of the phagocytosed pathogens to other immune system cells. (KEYSTONE/SCIENCE PHOTO LIBRARY/RAMON ANDRADE 3DCIENCIA)