DescriptionTopBP1 initiation of DNA replication.png
English: As the cell enters S phase, the MCM complex is loaded onto double stranded DNA in anticipation of replication. Treslin is phosphorylated by the cell cycle checkpoint kinase CDK2, which allows it to interact with TopBP1. The Treslin-TopBP1 complex recruits CDC45 to the MCM complex and DNA replication is officially initiated.
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