1. Institute of Reproductive and Developmental Biology (S.L., T.K., L.F., M.C.J., J.M.F., G.Z., J.J.B.), London W12 ONN, United Kingdom;
2. Wolfson and Weston Research Centre for Family Health, and Cancer Research-United Kingdom Laboratories and Section of Cancer Cell Biology (P.A.M., R.V., A.E., S.F.d.M., E.W.-F.L.), Department of Cancer Medicine, Imperial College London, Hammersmith Hospital, London W12 ONN, United Kingdom;
3. Department of Obstetrics and Gynaecology (J.M.H.), Imperial College London, St. Mary’s Hospital, London W2 1PG, United Kingdom