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Cell viability of U87MG after 24 and 48 h of incubation with He µCAP indirect treatment (a) and direct treatment (b) for 0, 5, 10, 30, 60, and 120 s. The ratios of surviving cells for each cell line were calculated relative to controls (0 s) in DMEM. Student t-test was performed, and the statistical significance compared to cells present in DMEM (0 s) is indicated as * p < 0.05, ** p < 0.01, *** p < 0.001. (n = 3).
