SLC12A1 (solute carrier family 12, member 1) is a member of SLC12A family of electrically neutral cation-chloride cotransporters, which contains both NaCl and KCl co-transporters. It is a bumetanide-sensitive Na-K-2Cl cotransporter and is also called NKCC2. This gene is localized to human chromosome 15 (NKCC2). This transporter resides predominantly in the plasma membrane, and has three different isoforms namely, NKCC2B, NKCC2A and NKCC2F. It has twelve transmembrane helices, with its N-terminal facing the cytoplasm. Its transport domain is made of two structurally homologous domains, made of 5-helices each. It has a large C-terminal, present intracellularly, which is responsible for dimerization of the protein.