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Science  10 Jul 1998:
Vol. 281, Issue 5374, pp. 139
DOI: 10.1126/science.281.5374.139e

Cells perform their own quality control, carefully checking their DNA for breaks before entering mitosis. In this week's Enhanced Perspective (p. 185), Walworth describes the molecules behind this process, including a key protein, RAD9. Online hyperlinks lead to explanations, illustrations, and movies of the cell cycle, plus more info about RAD9 itself.

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