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(a) CD16+3−8− and CD56+3−8− NK cell subsets and co-expression of CD57 in normal subjects, common variable immunodeficiency (CVID) and X-linked agammaglobulinaemia (XLA) patients. (b) CD16+3−8dim and CD56+3−8dim NK cell subsets and co-expression of CD57 in normal subjects (n = 19), CVID (n = 11) and XLA patients (n = 6). Bars represent the median, tails represent the 25th to 75th percentiles. *P < 0·05; **P < 0·01; ***P < 0·001, by Mann–Whitney U-test when compared with normal subjects.
