Fig 1 (IMAGE) Higher Education Press Caption Fig 1 Credit Yixin Chen, Murad Al-Nusaif, Song Li, Xiang Tan, Huijia Yang, Huaibin Cai, Weidong Le 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.