Researchers (IMAGE) Optica Caption Weijian Yang (right) with graduate students Shu Guo (left) and Yunyang Li (middle) in front of the new two-photon microscope. Credit Molly M Bechtel, University of California, Davis Usage Restrictions None License Original 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.