Human Factor IX Transgenic Sheep Produced by Transfer of Nuclei from Transfected Fetal Fibroblasts Schnieke, Angelika E. ; Kind, Alexander J. ; Ritchie, William A. ; Mycock, Karen ; Scott, Angela R. ; Ritchie, Marjorie ; Wilmut, Ian ; Colman, Alan ; Campbell, Keith H. S. Abstract Publication: Science Pub Date: December 1997 DOI: 10.1126/science.278.5346.2130 Bibcode: 1997Sci...278.2130S