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Memory B cells are a type of lymphocyte crucial for acquired immunity. When the body encounters a foreign substance, or antigen, B cells can differentiate into plasma cells that produce antibodies. These antibodies neutralize or destroy the antigen. Other B cells, however, become memory B cells. These cells provide the immune system with long-lasting memory, allowing for a faster and more effective response if the same pathogen is encountered again. This secondary response is led by memory cells, which rapidly divide to create more antibody-producing cells and a new generation of memory cells.123

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