Predicted to enable NF-kappaB binding activity. Predicted to be involved in T cell receptor signaling pathway; positive regulation of T-helper 17 cell differentiation; and regulation of gene expression. Predicted to act upstream of or within several processes, including negative regulation of NF-kappaB transcription factor activity; negative regulation of T cell differentiation in thymus; and positive regulation of thymocyte apoptotic process. Predicted to be active in nucleus. Orthologous to human NFKBID (NFKB inhibitor delta). [provided by Alliance of Genome Resources, Apr 2022]