In the intracellular compartments, may function as a channel or small molecule transporter. Localizes to the postsynaptic Golgi apparatus region, also named Golgi outpost, which shapes dendrite morphology by functioning as sites of acentrosomal microtubule nucleation. Ubiquitously expressed. Especially abundant in pancreas, highly expressed in kidney, lower levels in heart, brain, skeletal muscle and placenta. Lowest expression in lung and liver. Belongs to the nonaspanin (TM9SF) (TC 9.A.2) family.