Fig. 5

Diphtheria-specific antibody concentrations were correlated with; the mean fluorescence intensity of p21 (a), CD8⁺CD57⁺ T cells expressing p21 (b), CD8⁺ T cells expressing KLRG-1 and p21 (c), and Reactive oxygen species (d): in the BM or all BMMCs (upper panels) and in the PB or all PBMCs (lower panels). Cells were stimulated with PMA and Ionomycin for 4 h at 37 °C. Correlation coefficients (r_p) and significances were calculated according to Pearson with correction for age