ATP1B3 (ATPase Na+/K+ Transporting Subunit Beta 3): ATP1B3 is a component of the Na⁺/K⁺ ATPase pump, which maintains cellular ion gradients essential for cell volume regulation and electrical activity. This subunit influences the pump’s activity and specificity, supporting muscle function, nerve signaling, and kidney filtration. Alterations in ATP1B3 may be linked to cardiovascular and neurological disorders.