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Monocyte subsets in young and aged humans. a Representative cytofluorograph of four subsets of monocytes based upon expression of CD14 and CD16 antigens from a young subjects. b Cumulative data for the proportions and c numbers of four subsets of monocytes from 17 young and 17 aged subjects. Data are expressed as mean ± SD. *P < 0.05, **P < 0.01
