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Late expanding euploid embryos that are cryopreserved (CRYO) with subsequent synchronous transfer have high sustained implantation rates (SIR) similar to fresh normally blastulating euploid embryos

      Recent studies have shown that embryos that do not blastulate until day 6 (D6) have lower SIRs in fresh transfers. This diminution might be due to impaired embryo quality or to a loss of embryonic-endometrial synchrony. This study controls for embryo ploidy status to enhance the ability to evaluate the impact of dyssynchrony.
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