Involved in double-strand break repair via nonhomologous end joining and immunoglobulin V(D)J recombination. Is active in site of double-strand break. Is expressed in several structures, including adipose tissue; alimentary system; eye; male reproductive gland or organ; and nervous system. Orthologous to human CYREN (cell cycle regulator of NHEJ). [provided by Alliance of Genome Resources, Apr 2022]