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The use of a counterselection system to select phenotypically high-producing cells, as in the present study, may critically depend on an appropriate choice of counter-selectable marker gene
Oocytes showing a germinal vesicle (GV) chromatin configuration were considered immature, and those showing a metaphase plate and a polar body were categorized as mature metaphase II (MII) oocytes
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Archived from the original on 27 September 2007
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