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Specific and nonspecific cell-mediated effector mechanisms have been simultaneously assayed in 15 aged humans. 8 were female and 7 male, including a 114-year-old male in remarkably good health. Proliferative response to alloantigens, the generation of T killer cells and the ability to express cell-mediated lympholysis as well as the presence of natural cell-mediated cytotoxicity against K562 tumor cell line and the capacity to mount an ADCC response to RhD+ human red blood cell sensitized with anti-D antisera, revealed that in the human aged, while T function significantly declines, nonspecific cell-mediated effector mechanisms are operative.
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