KCNK9 (Potassium Two Pore Domain Channel Subfamily K Member 9): KCNK9 encodes a member of the potassium channel family, specifically a two-pore-domain potassium channel. These channels are involved in setting the resting membrane potential and regulating neuronal excitability. Mutations in KCNK9 have been associated with Birk-Barel mental retardation dysmorphism syndrome, highlighting its role in neural development and function....