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This study assessed 1908 embryos, including those with abnormal numbers of pronuclei, in IVF cycles from July 2001 to December 2006 in which preimplantation genetic screening (PGS) was performed on day 3 post-retrieval and ‘euploid’ embryos transferred the following day. PGS-intracytoplasmic sperm injection and PGS-translocation cycles were excluded. At 18 h post-insemination, the zygote distribution...
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