May act as a transporter. Expressed on cortical epithelial cells in the thymus. Mainly expressed in the thymic cortex and is highly enriched in SCID thymus. Also expressed in lymph nodes, heart, fetal liver, brain, spleen, intestine and kidney, but not in adult liver, skin, skeletal muscle and lung. Highly expressed during fetal thymus development and decreases after day 16. Glycosylated. Belongs to the major facilitator superfamily. SLC46A family.