G1 phase, S phase (synthesis), G2 phase (collectively known as interphase) and M phase (mitosis)

Phases 

    The cell cycle consists of four distinct phases: G1 phase, S phase (synthesis), G2 phase (collectively known as interphase) and M phase (mitosis). M phase is itself composed of two tightly coupled processes: mitosis, in which the cell's chromosomes are divided between the two sister cells, and cytokinesis, in which the cell's cytoplasm divides in half forming distinct cells. Activation of each phase is dependent on the proper progression and completion of the previous one. Cells that have temporarily or reversibly stopped dividing are said to have entered a state of quiescence called G0 phase.

After cell division, each of the daughter cells begin the interphase of a new cycle. Although the various stages of interphase are not usually morphologically distinguishable, each phase of the cell cycle has a distinct set of specialized biochemical processes that prepare the cell for initiation of cell division.

G1 phase, CDKCs bind and phosphorylate members of the retinoblastoma (Rb)

During late G1 phase, CDKCs bind and phosphorylate members of the retinoblastoma (Rb) protein family. Members of the Rb protein family are tumor suppressors, which prevent uncontrolled cell proliferation that would occur during tumor formation. However, pRbs are also thought to repress the genes required in order for the transition from G1 phase to S phase to occur. When the cell is ready to transition into the next phase, CDKCs, cyclin D1-Cdk4 and cyclin D1-Cdk6 phosphorylate pRB, followed by additional phosphorylation from the cyclin E-Cdk2 CDKC. Once phosphorylation occurs, transcription factors are then released to irreversibly inactivate pRB and progression into the S phase of the cell cycle ensues. The cyclin E-Cdk2 CDKC formed in the G1 phase then aids in the initiation of DNA replication during S phase.