Abstract
Molecular Biology Cell division is controlled by checkpoints that regulate the temporal order of the cell cycle phases, including the G1/S, G2/M, and metaphase/anaphase transitions. Yet there are no known control mechanisms for a fourth fundamental transition—the S/G2 transition. Saldivar et al. report a switchlike control mechanism that regulates the S/G2 transition. The checkpoint kinase ATR senses ongoing DNA replication in S phase and represses the mitotic transcriptional network, ensuring that DNA replication in S phase is completed before mitosis. Science , this issue p. [806][1] [1]: /lookup/doi/10.1126/science.aap9346
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