1. Medical Research Council Human Reproductive Sciences Unit (R.A.L.B., C.S.C., A.J.C., H.N.J.), University of Edinburgh Centre for Reproductive Biology, The Queen’s Medical Research Institute, Edinburgh EH16 4TJ, United Kingdom
2. Division of Reproductive and Developmental Sciences (S.L.E., R.A.A.), University of Edinburgh Centre for Reproductive Biology, The Queen’s Medical Research Institute, Edinburgh EH16 4TJ, United Kingdom