Involved in the control of early migration of neurons expressing gonadotropin-releasing hormone (GNRH neurons) (By similarity). May be involved in the maintenance of osteochondroprogenitor cells pool (PubMed:14962803). Expressed in bone. Main expression is present in mesenchymal osteochondroprogenitors with fibroblast-like morphology abundant in the regions of active bone modeling and remodeling. By estrogen and blood loss. N-terminally cleaved to produce a form of around 663 residues.