Phenotypic characterization of CD3+ CD56+ T cells. (A) Representative histograms illustrating CD38, NKG2A, NKG2C, and CD57 expression on CD3+ CD56+ T lymphocytes. The scatter plots represent the frequencies of CD38 (n = 26 HCMV−; n = 39 HCMV+; n = 10 PHIP), NKG2A (n = 26 HCMV−; n = 38 HCMV+; n = 17 PHIP), NKG2C (n = 25 HCMV−; n = 39 HCMV+; n = 14 PHIP), and CD57 (n = 26 HCMV−; n = 39 HCMV+; n = 16 PHIP) CD3+ CD56+ T lymphocytes. (B) Representative density plots illustrating CD161 and ILT-2 expression on CD56+ T lymphocytes (n = 26 HCMV−; n = 37 HCMV+; n = 11 PHIP). The scatter plots represent the frequencies of KIR2D, CD161, and ILT-2 on CD56+ T lymphocytes in HCMV− and HCMV+ individuals and PHIP. Means and SEM are shown. *, P < 0.05; **, P < 0.01; ****, P < 0.0001.