1. GTC Biotherapeutics, Inc., Framingham, Massachusetts.
2. Nexia Biotechnologies Inc., Vaudreuil-Dorion, Quebec, Canada.
3. Department of Biomedical Science, Tufts University School of Veterinary Medicine, North Grafton, Massachusetts.
4. LSU Embryo Biotechnology Laboratory, Department of Animal Sciences, Louisiana State University Agricultural Center, Baton Rouge, Louisiana.