GTP-binding protein that functions as a molecular switch for the activation of 'new end take off' (NETO), a process in which the directions of cell growth change from a monopolar manner to a bipolar manner in fission yeast. Involved in supplying membrane to the growing new end. Localizes at both cell ends and presumptive septa in a cell-cycle dependent manner. Belongs to the small GTPase superfamily. Arf family.