May be involved in the lateral transport of nicotianamine-chelated metals in the vasculature. Found almost exclusively on the lateral plasma membranes. Expressed in roots, leaves and weakly in shoots. Restricted to the veins, to the central cylinder of the young roots and to the pericycle and the endodermis cells facing the meta-xylem tubes in older roots. Expressed in the vasculature of sepals, petals, anthers, stigma and siliques, but not in developing seeds or in meristematic zones. Inhibition upon iron and zinc deficiency. Not regulated by copper. Subjected to diurnal regulation. No visible phenotype. Belongs to the YSL (TC 2.A.67.2) family. Truncated N-terminus.