Neuron navigator 2 (NAV2), also known as RAINB1 (retinoic acid inducible in neuroblastoma 1), POMFIL2 (pore membrane and/or filament-interacting-like protein 2), HELAD1 (helicase APC down-regulated 1), unc53H2 or steerin-2, is a 2,488 amino acid nuclear