Figure 3. Age related changes in surface receptor expression. A.

Percentages of NK, NKT, CD3⁺, and CD8⁺ T cells in PBL are shown as a mean ± SEM based on different age group. B. The age related percentage change of CD56^dim and CD56^bri NK subsets in NK cells shown as a mean ± SEM. C. Distribution of CD56^bri: CD56^dim ratio in different age groups. D.-G. The expression level of NKG2D(D), CD69 E., CD57 F., and CD16 G. on the indicated cell populations. Each graph is shown as a mean (±SEM). *p < 0.05, **p < 0.01,***p < 0.001 by Turkey HSD test comparison of the four age groups post hoc analyses.