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. 2016 Jan 19;6:19465. doi: 10.1038/srep19465

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Open pulled straw (OPS), nylon loop, and mini-drop were used to load oocytes for cryopreservation. (A) Oocyte survival. (B) Fertilization. (C) Blastocyst formation. Different superscript letters (a,b) indicate p < 0.01.