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In page Adaptive immune system:

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When B cells and T cells are activated some become memory B cells and some memory T cells. Throughout the lifetime of an animal these memory cells form a database of effective B and T lymphocytes. Upon interaction with a previously encountered antigen, the appropriate memory cells are selected and activated. In this manner, the second and subsequent exposures to an antigen produce a stronger and faster immune response. This is "adaptive" in the sense that the body's immune system prepares itself for future challenges, but is "maladaptive" of course if the receptors are autoimmune. Immunological memory can be in the form of either passive short-term memory or active long-term memory.[citation needed]