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प्रश्न
How can memory cells be differentiated from other activated lymphocytes?
लघु उत्तर
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उत्तर
Memory cells do not produce antibodies and do not kill infected cells. They remain in the lymph nodes for years (even decades) after the antigen has disappeared and respond rapidly to any future attack by the same antigen. In contrast, activated (effector) lymphocytes directly fight the infection and survive only for a few days.
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