Orphan receptor. Could be involved in a signal transduction pathway controlling epididymal function and male fertility. May regulate fluid exchange within epididymis. Heterodimer of 2 chains generated by proteolytic processing; the large extracellular N-terminal fragment and the membrane-bound C-terminal fragment predominantly remain associated and non-covalently linked. Epididymis-specific expression (at protein level). Associated with apical membranes of efferent ductule and proximal epididymal duct epithelia (PubMed:12420295). Proteolytically cleaved into 2 subunits, an extracellular subunit and a seven-transmembrane subunit. Highly glycosylated. Belongs to the G-protein coupled receptor 2 family. Adhesion G-protein coupled receptor (ADGR) subfamily.