Inhibits endothelial cell migration (in vitro). May be involved in G protein-linked signaling (By similarity). Interacts with GLUT1 (C-terminus), ACTN1, KIF1B, MYO6 and PLEKHG5 (By similarity). Interacts with RGS19 C-terminus. Interacts with SDC4/syndecan-4 and SEMA4C/semaphorin-4C. Widely expressed. Detected already at 4.5 dpc, expression peaks at 11.5-12.5 dpc and gradually declines to its adult levels by 18.5 dpc. Belongs to the GIPC family.