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In the course of a mixed lymphocyte culture, memory cells are produced which can give rise to a large secondary cytotoxic lymphocyte response on reexposure to the sensitizing alloantigen. We have studied the lineage of these memory cells using a clonal assay for precursors of cytotoxic T lymphocytes (CLP). Our data provide conclusive evidence that individual CLP, upon stimulation with alloantigens, gives rise to clones which contain memory cells of the same specificity as the CLP. Only half of the clones that responded in the primary stimulation could be reactivated upon exposure to the original priming alloantigen.

Quantitative studies on the precursors of cytotoxic lymphocytes. III. The lineage of memory cells.