JACOPIN / SCIENCE PHOTO LIBRARY JACOPIN / SCIENCE PHOTO LIBRARY
IMMUNE SYSTEM, ILLUSTRATION An organism's defense mechanisms. An organism's defense mechanisms. Illustration of a body's immune responses to invasions by antigens, viruses or bacteria. On the left, fragments of antigens are presented by the dendritic cells to the T CD4 lymphocytes which trigger an immune response which incites killer T CD8 lymphocytes to destroy the infected cells and memory T CD8 lymphocytes to be stored in case of a new attack. On the right, the antigens are presented to the B lymphocytes which recognize them, triggering an immune response producing antibodies capable of destroying the antigen and memory B lymphocytes to be stored in case of a new attack.
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