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Objective To explore the relationship between the patterns of pronucleus and embryo development and pregnancy potential in the pronuclear stageMethods According
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Objective To explore the relationship between the patterns of pronucleus and embryo development and pregnancy potential in the pronuclear stageMethods According to the number and distribution of nucleolar precursor bodies, the embryos at pronuclear stage were classified into 6 pronuclear patterns from 0 to 5, 16～18 h after in vitro fertilization (IVF) or intracytoplasmic sperm injection (ICSI). For each pattern, the subsequent embryonic morphology and the pregnancy rate were analyzed. Results Embryos of Pattern 0 developed to significantly more embryos with good quality and higher pregnancy potential than the embryos developing from other patterns (83.14% and 76.11% respectively, P
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