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This study compared the developmental and implantation potential of tetrahedrally arranged versus non-tetrahedrally arranged 4-cell-stage embryos. If the cleavage planes of a 4-cell-stage embryo were perpendicularly orientated, blastomeres were defined as tetrahedrally arranged, while embryos with parallel-orientated cleavage axes were considered as non-tetrahedral embryos. The 4-cell-stage embryos...
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