1. National Center for Cool and Cold Water Aquaculture; ARS-USDA; 11861 Leetown Road Kearneysville WV 25430 USA
2. Institute of Molecular Biology; University of Oregon; Eugene OR 97403-1229 USA
3. Department of Animal Science; University of California; Davis CA 95616 USA
4. School of Biological Sciences and Center for Reproductive Biology; Washington State University; Pullman WA 99164-4236 USA
5. INRA; UMR 1313 GABI; Génétique Animale et Biologie Intégrative; Jouy-en-Josas 78350 France
6. Division of Animal and Nutritional Sciences; West Virginia University; Morgantown WV 26506 USA
7. Department of Biology; Middle Tennessee State University; Murfreesboro TN 37132 USA