May play a role in BANF1 regulation and influence tissue-specific roles of BANF1. Homodimer. Heterodimerizes with BANF1. Expressed strongly in testis and pancreas. Also detected in brain, colon, liver, lung, ovary, placenta, prostate, small intestine, spleen and thymus. Not detected in heart, kidney and skeletal muscle. Belongs to the BAF family. In contrast to BANF1, it does not seems to bind DNA.