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 (PubMed:33273469). NALCN complex consists of NALCN and auxiliary subunits, UNC79, UNC80 and NACL1. These auxiliary subunits are essential for the NALCN channel function (By similarity). Belongs to the NALF family.