Fig 1 (IMAGE) Higher Education Press Caption Fig 1 Credit Xin-Hui Chen , Kun-Xiong Guo , Jing Li , Shu-Hui Xu , Huifang Zhu , Guang-Rong Yan 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.