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. 2006 Jun 23;114(9):1401–1406. doi: 10.1289/ehp.8969

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p53 and ID1 expression in cells after G₂ phase synchronization. Cells were synchronized, treated with 5 μM NaAsO₂, and samples were taken at the indicated times. Levels of p53 and ID1 proteins were assessed by Western blot analysis with β-actin as a loading control. 0 hr = release from Hoechst 33342. A representative example is shown.