Predicted to enable DNA-binding transcription activator activity, RNA polymerase II-specific and RNA polymerase II cis-regulatory region sequence-specific DNA binding activity. Acts upstream of or within several processes, including NIK/NF-kappaB signaling; follicular dendritic cell differentiation; and germinal center formation. Located in nucleus. Is expressed in several structures, including early conceptus; genitourinary system; musculature; thymus primordium; and trigeminal ganglion. Used to study common variable immunodeficiency. Human ortholog(s) of this gene implicated in common variable immunodeficiency. Orthologous to human NFKB2 (nuclear factor kappa B subunit 2). [provided by Alliance of Genome Resources, Apr 2022]