Embryo: Z is zygote and G is gamete (egg or sperm). ZIFT already contains the fertilized egg. Both techniques essentially were replaced by IVF and normal uterine embryo transfer 15 years ago. Unless there is no way to get an embryo into your cervix and into the uterus (severe scarring, permanent cerclage, etc), normally those would never be used anyway
Answered 11/14/2014
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