GTP-binding protein that functions in embryogenesis, cytokinesis, germline development and microtubulule cytoskeleton dynamics. Some diffuse cytoplasmic expression is detected but expression is concentrated mainly next to centrosomes and is excluded from the mitotic spindle area. Localizes to the cortical plasma membrane of embryonic blastomeres (By similarity). Belongs to the small GTPase superfamily. Arf family.