Na+/K+ transporting ATPase interacting 4 is a human gene encoded by the symbol, NKAIN4. It may also be known as: Sodium/potassium-transporting ATPase subunit beta-1-interacting protein 4; Na(+)/K(+)-transporting ATPase subunit beta-1-interacting protein 4; Protein FAM77A; C20orf58; FAM77A; bA261N11.2. The encoded protein has an amino acid length of 208 and a mass of 23.2 kDa. Other isoforms may exist. Na+/K+ transporting ATPase interacting 4 is a member of the NKAIN family. Homologs of this gene exist in other organisms, including: Mouse, Rat, Zebrafish, Frog, Chicken.