Fig. 4From: Natural killer (NK) cells inhibit systemic metastasis of glioblastoma cells and have therapeutic effects against glioblastomas in the brainLarge-scale in vitro expansion human NK cells and their phenotypic characteristics. a The expanded human NK cells were analyzed for various immune cell markers (n = 22). b The fold expansion of NK cells was determined by comparing the numbers of NK cells in the culture before (D0) and after (D14) the expansion (n = 20). c The viability of expanded NK cells was measured through propidium iodide staining (n = 20). Surface expression of activating (d) and inhibitory (e) receptors on expanded NK cells was analyzed by flow cytometry (n = 13). Data = mean + SD for (d) and (e)Back to article page