This gene encodes a member of the IgLON subfamily in the
immunoglobulin protein superfamily. The encoded protein is
localized in the plasma membrane and may have an accessory role in
opioid receptor function. This gene has an ortholog in rat and
bovine. The opioid binding-cell adhesion molecule encoded by the
rat gene binds opioid alkaloids in the presence of acidic lipids,
exhibits selectivity for mu ligands and acts as a GPI-anchored
protein. Since the encoded protein is highly conserved in species
during evolution, it may have a fundamental role in mammalian
systems. Two transcript variants encoding different isoforms have
been found for this gene.
