CDC42BPB and infection: Western blotting and graphical presentation with statistical analysis confirmed that P-Ser-Siah2, P-Thr-Siah2 increased significantly along with Siah2 after mrckβ overexpression and 12 h H. pylori-infection (Fig. 4b), but not at 6 h, when Siah2 did not yet reach its optimal level.