Figure 1 (IMAGE) Higher Education Press Caption Figure 1 Credit Libo HUANG , Jing ZHANG , Ling YANG , Sheng MA , Yongwen WANG , Yuanhu CHENG 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.