An integral mLin-2/CASK CKII domain is required for binding to X11α. A, Schematic representation of mLin-2/CASK and GST fusion proteins used in this study.B, Myc-tagged X11α expressed in 293 cells was precipitated by mLin-2/CASK GST coupled to glutathione beads, and bound proteins were revealed by Western blot with anti-myc antibody.C, Same as B, with different mLin-2/CASK constructs.