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Natural killer (NK) cell cytotoxicity and lymphocyte proliferation at baseline and 6-month follow-up. Top, NK cell cytotoxicity at different effector: target cell ratios. Values are medians, with error bars representing semi-interquartile range (SIQR). Bottom, lLymphocyte proliferation responses. Values are means with error bars representing standard error of the mean. PHA, phytohemagglutinin.
