1. Beijing Genomics Institute, Chinese Academy of Sciences, Beijing 101300, China (J.B., C.C., X.Z., Y.Z., S.L., J.W., H.Y., J.Y.); Graduate School of the Chinese Academy of Sciences, Beijing 100039, China (J.B., C.C., Y.Z.); James D. Watson Institute of Genome Sciences, Zhejiang University, Hangzhou 310008, China (S.L., J.W., H.Y., J.Y.); Institute of Genetics and Developmental Biology, Chinese Aca