Probable nuclear receptor coregulator that can have both coactivator and corepressor functions (By similarity). Important for maintenance of the adult pluripotent stem cell population (PubMed:24268775). Expressed in somatic stem cells. Also detected in testes where it appears to be expressed mainly in spermatocytes and round spermatids. RNAi-mediated knockdown results in severe impairment of regenerative capacity. The cycling stem cell population is significantly reduced at 8 days post-injection. Isolated stem cells are unable to repopulate an irradiated (and thus stem cell-depleted) host.