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Representative immunostaining images of the proliferation marker Ki-67 in HDF cells, 24 h after exposure to (A) 0 s (control) (B) 10 s (C) 40 s (D) 70 s, and (E) 100 s 3D mode of second-trimester fetal sonography condition. (F) Quantification of Ki-67-positive cells after exposure to different times of 3D mode of diagnostic ultrasonography. Data represent the mean ± SD of three independent experiments.* P < 0.05.
