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Cover The cyclin-dependent kinase inhibitor p27Kip1 regulates cell migration by inhibiting Rho activation. Shown here
are p27-null mouse embryo fibroblasts stained with phalloidin (red) to visualize F-actin, vinculin (green) to visualize focal
adhesions, and Hoescht 33342 (blue) to visualize DNA. The cells display an increased number of actin stress fibers and
focal adhesions, suggesting an enhanced activation of Rho signaling. (For details, see Besson et al., p.862.)