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The use of superovulation techniques to improve and simplify human in vitro fertilization (IVF) leads to a problem of large numbers of oocytes and consequently embryos being produced. Solutions to avoid the creation of supernumerary embryos might include limiting the number of oocytes recovered or inseminated. Equally to avoid the risk of multiple pregnancies, it would be possible to discard supernumerary...
The aim of clinical in vitro fertilization (IVF) is to obtain a viable pregnancy leading to the birth of a healthy baby. This has been achieved through the transfer of embryos at the pronuclear (day 1), cleavage (day 2-to-3) and blastocyst stages (day 5-to-6). In fact, the transfer of a blastocyst established the first clinical IVF pregnancy (Edwards et al, 1995). However, with respect to outcome,...
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