Telomere fluorescence in CD4⁺ naive T cells and memory T cells from patients A-D.

CD4⁺ naive T cells are indicated by shaded circles, and memory T cells are indicated by solid squares. Telomere loss (bp/y) was calculated by linear regression analysis only for the naive cells of the patient. Telomere fluorescence of naive (open circles) and memory (open squares) cells from their respective donors is shown at the time of transplantation and at the time indicated (dotted line).