Receptor for opioid growth factor (OGF), also known as Met-enkephalin. Seems to be involved in growth regulation. The OGF/OGFR complex is probably translocated to the nucleus. Highly expressed in the heart and liver, moderately in skeletal muscle and kidney and to a lesser extent in brain and pancreas. Expressed in fetal tissues including liver and kidney. Belongs to the opioid growth factor receptor family. OGFr entry