A long-lived lymphocyte capable of responding to a particular antigen on its reintroduction, long after the exposure that prompted its production.
- These established memory cells will then be capable of rapidly proliferating upon initial virus infection.
- Once the antigenic stimulation is removed, lymphocytes become quiescent and only some remain viable as memory cells.
- Both types of rejection leave memory cells that remain in circulation to mobilize the immune system if the same foreign antigen is reintroduced.
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