... activity of the Ring- Ring complex ofpolycomb proteins Bmi1 and Ring1 b. EMBO J 25,2465–2474.20 Poyurovsky MV, Priest C, Kentsis A, Borden KL, PanZQ, Pavletich N & Prives C (2007) The Mdm2 RING domain ... representation of the Unkempt-derived proteins used in the present study. Zinc finger and RING finger motifs are in dark and lightgrey, respectively. The C to A mutations of the RING finger in UNK-C-ter ... the amount of Rac1 in the nucleus (i.e. accumulation in late G2 and exclusion inearly G1) [26]. These results prompted us to investigatewhether the binding of activated Rac might influencethe...