PET Tracer Synthesis Precursor (IMAGE) DOE/Lawrence Berkeley National Laboratory Caption This is the molecular structure of a gold-based precursor used for PET tracer synthesis, determined by X-ray crystallography. Credit Mark Levin/UC Berkeley, Berkeley Lab Usage Restrictions None 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.