T-cell subsets in CBL (□) and ABI (▧). The mean percentage of CD4⁺CD45RA⁺, CD4⁺CD45RO⁺, CD8⁺CD45RA⁺, and CD8⁺CD45RO⁺ subsets in six samples of CBL and six samples of ABL is shown. The results are expressed as a percentage of the total lymphoid population.