Research Perspective Volume 4, Issue 3 pp 159—165
Cell cycle arrest is not yet senescence, which is not just cell cycle arrest: terminology for TOR-driven aging
Figure 1. Quiescence versus senescence.
Q: quiescent cell. In the absence of the growth factors, normal cells undergo cell cycle arrest. S: senescent cell. When cell cycle is arrested, the growth signal (if it cannot reactivate cycling) drives senescence.