May be a transcriptional corepressor with KLF4. Interacts with KLF4. Strongly expressed in testis and embryonic stem cells. In testis, detected in condensing spermatids but not at earlier stages of spermatogenesis (PubMed:11063263). In embryonic stem cells, expressed in undifferentiated cells and down-regulated upon differentiation (PubMed:24161396). Belongs to the krueppel C2H2-type zinc-finger protein family. Truncated N-terminus.