By acting through a filamin-A/F-actin axis, it controls the start of neocortical cell migration from the ventricular zone. May be able to induce the degradation of filamin-A. Interacts with FLNA. Interacts with RHOD (in GTP-bound form). Moderately expressed in adult heart and brain. Weakly expressed in lung, skeletal muscle, ovary, testis, kidney, and fetal brain, and hardly detectable in liver, pancreas, spleen, and fetal liver. Within brain, moderate expression is found in amygdala and caudate nucleus. Belongs to the FILIP1 family. Truncated N-terminus.