Figure 3. Phenotypic analysis of NK cells before expansion (D0), after expansion (D21), and after cryopreservation. Expression of activating receptors (A), inhibitory receptors (B), and chemokine receptors (C) of NK cells was analyzed by flow cytometry. Cryopreserved NK cells were analyzed immediately after thawing without further culture or cytokine stimulation.

^**p<0.01; ^***p<0.001.