Overview cell cycle Stages interphase G1 login to view 11 more bullets S login to view 14 more bullets G2 login to view 6 more bullets mitosis (M) steps login to view 4 more bullets chemotherapeutic agents that target this stage login to view 4 more bullets Regulation control transitions between phases of cell cycle G1 checkpoint login to view 2 more bullets cyclins/cyclin-dependent kinases cyclin D login to view 3 more bullets tumor suppressors requires mutation in both copies before neoplasia occurs login to view 1 more bullet Rb login to view 3 more bullets P53 login to view 6 more bullets Cell types permanent enter G0 and cannot leave login to view 1 more bullet stable (quiescent) enter G0 and can leave when given appropriate stimulus login to view 1 more bullet labile never go to G0 constant division with a condensed G1 login to view 1 more bullet