This sequential expression followed the phases of the traditional cell cycle: G0/G1 (the cell grows larger), S (the cell replicates its DNA), and G2/M (the cell prepares for division and then splits).

The standard eukaryotic cell cycle consists of four phases: G1, S, G2, and M phases. There are three phase transitions in a cell cycle: G1/S to initiate DNA synthesis, G2/M to enter mitosis ...

Another important checkpoint takes place later in the cell cycle, just before a cell moves from G 2 to mitosis. Here, a number of proteins scrutinize the cell's DNA, making sure it is structurally ...