The effect ex vivo supplementation for three weeks with 30 μM ebselen or 7.5 mM NAC on the proliferation capacity of human PBMCs (A and C) or CD4+T cells ex vivo isolated from fresh human blood derived from five different healthy donors aged 55–60 years. A &B denotes the effect of 30 μM ebselen and C &D denotes the effect of 7.5 mM NAC. The bars indicate the mean ± S.D. Values statistically different from their controls (Student’s t-test, 95% confidence level) are indicated with an asterisk. ** p < 0.01, *** p < 0.001 - Significantly higher than the proliferative capacity of non-supplemented cells.