May have a role in neuroendocrine differentiation. Inhibits adipocyte differentiation. Monomer. Interacts with SH3RF2 (By similarity). Additional isoforms seem to exist. Highly expressed in fetal liver, placenta, adult adrenal gland, brain, testis and ovary and, to a lesser degree, in adult kidney, muscle, thymus and heart. Expression is elevated in liver after birth but starts to decline around postnatal day 16. N- and O-glycosylated.