D4 (IMAGE) University of North Carolina Health Care Caption This illustration shows the chemical architecture of amino acids that make up the D4 receptor bound to the antipsychotic drug nemonapride (pink). Credit UNC / UCSF Usage Restrictions credit properly License Licensed content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.