That means protein synthesis and organelle production continues in the G Two phase. Now, at the end of the G Two phase, just like the G One phase contains a checkpoint, the G Two phase also contains a checkpoint at the end. At the checkpoint, the cell basically checks for the level or the concentration of a certain type of protein known as the mitosis promoting factor or MPF. MPF sometimes also stands for the maturation promoting factor. Now, if the concentration levels are high enough, the cell will basically exit the G Two phase and exits the interface and enters the second stage known as the M stage. So as we'll see in the next lecture this is the stage that consists of the process of mitosis which is the process by which the cell basically divides and produces an identical daughter cell.