Every time a cell divides, it must accurately copy its entire genetic instruction manual. Before this process can begin, cells load their DNA-copying motor—a complex of six subunits known as the MCM2-7 helicase—onto DNA. However, this motor is deliberately kept inactive to prevent replication f...
Source: [Phys.org](https://phys.org/news/2026-08-snapshots-reveal-key-dna-replication.html)