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). Localized along actin stress fibers, except at their ends, suggesting colocalization with F-actin (fiber-like). Punctate distribution in the cytoplasm distinct from that of F-actin. Expressed in muscle tissue, including heart. Found in cortical ventricular zone. Belongs to the FILIP1 family.