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 regulating cell volume and electrical activity. This subunit affects the pump’s function and specificity, aiding muscle activity, nerve transmission, and kidney filtration. Changes in ATP1B3 may be associated with cardiovascular and neurological conditions.