(A) Staining of CD3+CD4+ normal and patient T cells for expression of CD45RO and CCR7 reveals accelerated age-dependent loss of naïve CD45RO- CCR7+ T cells, with accumulation of CD45RO+CCR7+ central memory and CD45RO+CCR7- effector memory cells. C = normal control subject, 20 years old; P364L-1 (P1), 18 years old; P364L-2 (P2), 12 years old; P364L-3 (P3), 4 years old. (B) Staining of CD3+CD8+ normal and patient T cells for expression of CD45RO and CCR7 reveals a loss of naïve CD8+ T cells. (C) Expansion of the CD3+CD4+CD127- CD25+ Treg compartment in P364L RelB patients.