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Time-dependent internalization of DNA-NT inside the HeLa cells for 2 h (n = 15 cells, ∗∗P < 0.01). Internalization of DNA-NT at different intervals indicated by red fluorescence. (A) 5 min, (B) 10 min, (C) 15 min, (D) 30 min, (E) 45 min, (F) 1 h, (G) 1.5 h and (H) 2 h.
