Use of the egg-share model to investigate the paternal influence on fertilization and embryo development after in vitro fertilization and intracytoplasmic sperm injection  Denny Sakkas, Ph.D., Yvonne D'Arcy, B.Sc., Gail Percival, M.Sc., Lucinda Sinclair, R.N., Masoud Afnan, M.D., Khaldoun Sharif, M.D.  Fertility and Sterility  Volume 82, Issue 1, Pages 74-79 (July 2004) DOI: 10.1016/j.fertnstert.2003.11.054

Figure 1 The difference in mean embryo score between transferred embryos from patients undergoing egg sharing when either (A) both patient couples underwent IVF or when (B) one couple was treated by ICSI and the other IVF. Mean embryo score was calculated as stated in the Materials and Methods. The mean embryo score for all transferred embryos was then calculated for the sharer and recipient. Subtracting the sharer and recipient score represents the difference in mean embryo score. Sakkas. Egg sharing evidences a paternal influence. Fertil Steril 2004. Fertility and Sterility 2004 82, 74-79DOI: (10.1016/j.fertnstert.2003.11.054)