Fig. 5

Percentage of monocyte subsets expressing co-inhibitory molecules decreased in older adults. A. Representative flow cytometry histograms display the expression of the co-inhibitory molecules 2B4, T-cell immunoglobulin domain and mucin domain 3 (TIM-3), CD200R, T-cell immunoglobulin and immunoreceptor tyrosine-based inhibitory motif (ITIM) domain (TIGIT), B and T lymphocyte attenuator (BTLA), CD160, programmed death-1 (PD-1), and lymphocyte-activation gene 3 (LAG-3) on monocyte subsets from young adults. B. The percentage of monocyte subsets expressing TIM-3, 2B4, CD200R, TIGIT, and BTLA from young, middle-aged, and older adults (young: 21–40 years, n = 42; middle-aged: 41–60 years, n = 34; older: > 60 years, n = 34). P-values were calculated using the non-parametric Kruskal–Wallis rank test, followed by post hoc analysis