1. Division of Gene Function and Development, Roslin Institute, Scotland, United Kingdom.
2. Assisted Conception Unit, University College London, United Kingdom.
3. Department of Obstetrics and Gynaecology, University College London, United Kingdom.
4. Research Animal Pathology Core, University of Edinburgh, Edinburgh, United Kingdom.
5. Applied Biosystems, Warrington, United Kingdom.
6. Geron Corporation, Menlo Park, California.