Figure 1

Correlations between lymphocyte subpopulations in the photoperiod. In the photoperiod (06:00h-10:00h-14:00h) CD8+ dim correlates positively with CD16+ (r = 0.803, p < 0.001) and positively with γδTCR+ cells (r = 0.603, p = 0.005), CD16 correlates positively with γδTCR+ cells (r = 1.138, p < 0.001. There is no statistically significant correlation in old aged subjects.