The function of SLC13A4 (solute carrier family 13 member 4, Ensembl gene identifier ENSG00000164707) is as follows. Sodium:sulfate symporter that mediates sulfate reabsorption in the high endothelial venules (HEV). {ECO:0000269|PubMed:10535998, ECO:0000269|PubMed:15607730}.