Has been proposed to act as a receptor for neuronostatin, a peptide derived from the somatostatin/SST precursor (PubMed:22933024, PubMed:26561648). Involved in blood sugar regulation through the induction of glucagon in response to low glucose (PubMed:26561648). Widely expressed (PubMed:22933024, PubMed:26561648). Not detected in the duodenum, nor in the exocrine pancreas (PubMed:22933024). Cleaved by FURIN to yield two fragments that remain associated via a disulfide bond. Belongs to the LU7TM family.