KCNMB3 (Potassium Calcium-Activated Channel Subfamily M Regulatory Beta Subunit 3): KCNMB3 is part of a family of calcium-activated potassium channels that help regulate neuronal excitability and vascular tone. This gene is important for blood pressure regulation and cardiovascular function, and variations in KCNMB3 may be linked to hypertension and heart disease.