Nephi Stella, University of Washington (image) University of Washington Caption Dr. Nephi Stella and his research team are studying subtances naturally produced in the brain that mimic the active ingredients of marijuana. Credit UW Usage Restrictions For use by news media and educational institutions only. 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.