E2F3_targets CycE1:CDK2 RB Apoptosis_entry E2F2_targets CDC25C E2F6 p27/p21 APC p16/p15 CycH:CDK7 Wee1 CycC:CDK3 E2F6_targets CycB1:CDC2 E2F7_targets E2F4 E2F4_targets E2F1 E2F1_targets E2F8_targets CycA2:CDK2 CycD1:CDK4/6 E2F5_targets