1. Oregon National Primate Research Center (P.M.C., C.C-F., G.M-N.) and Departments of Physiology and Pharmacology and Cell Oregon Health and Science University, Beaverton, Oregon 97006
2. Research Units in Developmental Biology (C.C-F., G.M-N.), Instituto Mexicano del Seguro Social, Mexico Distrito Federal 06725, Mexico
3. Developmental Biology (P.M.C.), Oregon Health and Science University, Beaverton, Oregon 97006
4. Reproductive Medicine (P.M.C.), Instituto Mexicano del Seguro Social, Mexico Distrito Federal 06725, Mexico