Respond to self-cells that have been invaded by non-self material, e.g. cancer cells, virus infected cells and phagocytes that have engulfed pathogens. They can distinguish these cells because they are antigen presenting cells, because they have antigens on their cell surface membranes.
The receptors on the T-cells are complementary to the antigens, and they fit onto antigens, which stimulates the T-cells to divide by mitosis, which develop into memory cells that will stimulate a rapid secondary response against the same pathogen in the future; stimulate phagocytes to perform phagocytosis; stimulate B cells to divide; and kill infected cells.
T-cells kill infected cells by producing a protein which makes holes in the infected cell surface membrane making it freely permeable.
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