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PHOTO: EAST NEWS/BSIP Les d??fenses de l'organisme. Repr??sentation des r??actions immunitaires lors de l'invasion d'un corps par des antigA?nes, virus ou bact??ries. - ?" gauche, les fragments d'antigA?nes sont pr??sent??s par des cellules dendritiques aux lymphocytes T CD4 qui d??clenchent la r??action immunitaire mobilisant des lymphocytes T CD8 "tueurs" permettant la destruction des cellules infect??es et des lymphocytes T CD8 "m??moires" stock??s en pr??vision d'une nouvelle invasion. - ?" droite, les antigA?nes sont pr??sent??s aux lymphocytes B qui les reconnaissent et d??clenchent une r??action immunitaire qui fabrique des anticorps capables de d??truire l'antigA?ne et mobilise des lymphocytes B "m??moires" stock??s en pr??vision d'une nouvelle invasion. 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 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 stored in case of a new attack.