Elevated Spy1 levels prevent contact inhibition. (A) Representative views of focus formation assays in NIH3T3 cells transfected with Myc-Spy1-WT, Myc-Spy1-TST, positive control Ras-V12 or empty vector PCS3 control. n = 3 (B) Quantification of the number of colonies. Error bars reflect SE between triplicate experiments. t test was performed;** P ≤ 0.01. n = 3 (right panel) Western blot analysis of one representative lysate from A-B.