We performed the analysis of peripheral blood lymphocyte populations by one laser three-color flow cytometry (BD Biosciences FACS Calibur, USA). One-hundred microliter of whole blood was obtained and stained with 20 μl of the monoclonal antibodies (CD3(fluorescein isothiocyanate (FITC)), CD4(FITC), CD8 (peridinin-chlorophyll protein complex (PerCP)), CD16 + 56(APC), and CD19 (phycoerythrin (PE)) (Beckton Dickinson, BD, USA)). Then, the samples were incubated in the dark for 15 min at room temperature.
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