Auxillary component of the NALCN sodium channel complex, a channel that regulates the resting membrane potential and controls neuronal excitability. Component of the NALCN channel complex. NALCN complex consists of NALCN and auxiliary subunits, UNC79, UNC80 and NACL1. These auxiliary subunits are essential for the NALCN channel function. Belongs to the NALF family.