{{ board.text }} p27Kip1 p21Cip1 p27Kip1 p21Cip1 Growth Factor Withdrawal Growth Factor Receptor Activation DNA Damage DBE FasL Bim TRAIL Apoptosis OFF ON E2F/DP Target Genes: Cyclin E/A, E2F-1/2/3, cdc2, c-Myc, p107, RanGAP, TK, DHFR, PCNA, H2A, etc. DNA Repair Critically Short Telomeres Nuclear Export, Ubiquitination Nuclear Exclusion UV IR {{ board.text }} {{ group.title }} {{ text.text }} {{ button.text }} {{ group.title }} {{ text.text }} Notes: 1:Clickable 2:Unclickable