Purified Crystals of DSFO(Me)4 (IMAGE) Cell Press Caption This photograph shows test tubes containing purified crystals of DSFO(Me)4, a model compound used in the study. Credit Zachary Rengert Usage Restrictions Credit Required. 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.