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The effect of two different methods of polar body biopsy followed by vitrification on the survival and development to blastocyst stage of mouse zygotes was examined. Prior to vitrification, a total of 119 and 124 mouse zygotes were subjected to polar body biopsy using either laser-assisted or partial zona dissection (PZD) techniques, respectively. Vitrification was also applied to 122 zona-intact...
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