Fig 4.

Effects of NK-92 Exo on the proliferation of normal cells. Phoenix-A cells, which are normal human kidney cells, were co-cultured with two concentrations of NK-92 Exo (5 and 20 µg) and bioluminescence signals were measured at 4, 10, and 24 h. NK-92 Exo showed no significant cytotoxicity against the phoenix-A cells even after 24 h (A). To confirm the bioluminescent imaging (BLI) results, a CCK-8 assay was also performed, and the results were consistent with those of BLI (B). Experiments were performed at least in triplicate and values ± SD were plotted.