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Activation levels, as demonstrated by percentage HLA-DR expression in the two study population groups, South African Africans (SAA; n = 16) and South African Caucasians (SAC; n = 23) within natural killer (NK) -cell and T-cell subsets. Box-whisker plots depicting the median (horizontal black line), 25th and 75th centiles (margins of the box) and the 10th and 90th centiles (whiskers). Outliers are indicated with (○). P-values have been indicated.
