Affiliation: | GUANG JIN PAN,ZENG YI CHANG,HANS R. SCHOLER,DUANQING PEI Departments of Pharmacology and Biological Sciences & Biotechnology,Schools of Sciences and Medicine,Tsinghua University,Beijing 100084,China Center for Animal Transgenesis and Germ Cell Research,School of Veterinary Medicine,Department of Animal Biology,University of Pennsylvania,New Bolton Center,382 West Street Road,Kennett Square,PA 19348,USA,Department of Pharmacology,University of Minnesota,Minneapolis,MN 55455,USA |