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Borna disease virus strains induce cell cycle arrest. (A) The harvested cells were stained with propidium iodide and assessed by flow cytometry at (B) 0, (C) 6, (D) 15 and (E) 24 h post-serum release. The data are expressed as the mean ± standard deviation from three independent experiments. *P<0.05, **P<0.01 vs. control. ns, not significant.
