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Expression of the activation marker CD107a on NK cells, after ex vivo incubation with K562 target cells, was significantly increased (p < 0.001) in the cRG-I groups. Increasing concentrations of exogenously added IL-2 reduced this effect (p < 0.03). Top: % of CD107a positive NK cells, and bottom: % change d-1 vs. d-55 (baseline), optimal for IL-2 concentrations 25–100 U/mL).
