1. University of California, La Jolla, California 92093 (K.D.G., M.F.W.)
2. Department of Clinical and Experimental Medicine, KU Leuven, 3000 Leuven, Belgium (K.D.G., G.V.)
3. Department of Biology, Western Washington University, Bellingham, Washington 98225 (P.S.A.)
4. Department of Reproductive Medicine and Institute of Genomic Medicine (M.F.W.)