Predicted to be involved in activation of NF-kappaB-inducing kinase activity; cellular protein modification process; and negative regulation of cell population proliferation. Located in nucleus. Part of COP9 signalosome. Is expressed in several structures, including early embryo; liver; and oocyte. Orthologous to human COPS8 (COP9 signalosome subunit 8). [provided by Alliance of Genome Resources, Apr 2022]