Predicting the chance of Stay start for elective oocyte cryopreservation: a counselling Device for medical professionals and individuals The zona pellucida initially assists to safeguard the egg and resulting embryo. However it is crucial which the embryo hatch in the zona pellucida for it to implant within the uterine wall https://thedirectoryblog.com/listings12931334/the-basic-principles-of-embryo-transfer