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Rebuilding an immune system: the timeline, lineage by lineage After a transplant the immune system comes back in a fixed order, and the order explains most of what follows. Neutrophils in two to four weeks, natural killer cells within a month, B cells over several months to a year, and T cells last and slowest. Adults rebuild a narrower repertoire, because the thymus shrinks with age. | none | none | rejuvenation, survivorship, transplant |