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After prolonged culture of human embryos, the expanded blastocysts with oval inner cell mass (ICM) and cohesive trophectoderm (TE) are preferably selected for transfer. In cycles with poor embryonic development, the selection has to be done from among suboptimal blastocysts for which no grading system exists. In this study, 1396 transferred blastocysts and morulae were classified into eight morphologic...
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