1. Department of Molecular Biology and Genetics (N.H., G.D.I., A.G.D., M.S., W.L.K.)Cornell University, Ithaca, New York 14853;
2. Graduate Field of Biochemistry, Molecular and Cell Biology (G.D.I., M.S., W.L.K.)Cornell University, Ithaca, New York 14853;
3. Graduate Field of Genetics and Development (A.G.D., W.L.K.),Cornell University, Ithaca, New York 14853;
4. Cecil H. and Ida Green Center for Reproductive Biology Sciences and Department of Obstetrics and Gynecology (M.S., W.L.K.), University of Texas Southwestern Medical Center, Dallas, Texas 75390;
5. Genome Institute of Singapore (E.C.), Singapore 138672;
6. Institute for Systems Biology (J.A.R.), Seattle, Washington 98103