memory cells
"Memory cells do not actively fight the current infection, but patrol the body in case of future infection with the same antigen. If the antigen should appear again the future, memory cells are like 'preactivated' B cells, and can initiate a much faster immune response (the secondary immune response)."
"Memory cells are like clones of the B cell, which has the antigens of the pathogen on it."
"Memory B cells are like the veteran players that know the other team well and are prepared for the next time the two teams play"
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