– May be involved in actively transporting phosphate into cells via Na(+) cotransport. It may be the main phosphate transport protein in the intestinal brush border membrane. May have a role in the synthesis of surfactant in lungs’ alveoli. SLC5A5 Protein, Human, Recombinant (B2M & His) is expressed in E. coli expression system with N-6xHis-B2M tag. The predicted molecular weight is 27.1 kDa and the accession number is O95436.