Doi:10.1016/j.rigp.2004.10.00
Reviews in Gynaecological Practice xxx (2004) xxx–xxx Cryopreservation of two pronuclear stage zygotes Yasser OriefNikos Safaa Department of Obstetrics and Gynecology, Shatby University hospital, Alexandria University, Egypt Laboratory of Reproductive Physiology, Faculty of Medicine, Demokritus University of Thrace, Dragana, 68100 Alexandroupolis, Greece Department of Obstetrics and Gynecology, Medical University of Lubick 23538, Germany