The following duplexed siRNAs (predesigned Ambion Silencer Select) were obtained from Life Technologies: LIMK 1, 156129 and s69232; LIMK 2, 156133 and s69236; TPPP/p25, s91408 and s91407; nonmuscle cofilin, Cfl1, s63902; cdc42 siRNA, s63741; and negative control siRNA # 1. SMGs were transfected with 500 nM siRNA using RNAiFect (Qiagen, Valencia, CA) and cultured for 24–48 h, as we reported previously (Daley et al., 2009 (link))