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- W2044910961 abstract "In the present study, some modifications were made to the zona-free nuclear transfer technique in the mouse in order to achieve greater efficiency. Firstly, a 1-h interval was allowed between cumulus removal and zona pellucida digestion. Secondly, acid Tyrode's was selected for zona pellucida removal, because contrary to pronase, it allows embryo survival during parthenogenic activation in the absence of calcium. Even when the exposure time to pronase was reduced to as little as 1 min or washed with fetal calf serum to inhibit the enzyme, the percentage of lysis during activation in the absence of calcium was still very high. Thirdly, electrofusion was performed at room temperature (21 degrees C), instead of 30 degrees C as in our previous experiments. Finally, embryos were cultured in groups of 12-15, instead of individually, using a well of the wells system during activation and culture. When compared, parthenogenic activated control embryos showed an increase in the development to blastocyst when cultured in pairs instead of individually. By the end of the experiments and using embryonic stem (ES) cells, there was a significant increase in fusion rate (1.5-fold increase) and in development to morula/blastocyst from cleaved reconstructed embryos (1.5-fold increase) when compared with the results before the modifications. A 2.4-fold increase in overall efficiency was achieved from the oocyte to morula/blastocyst stages." @default.
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- W2044910961 date "2006-03-01" @default.
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- W2044910961 title "Modifications to Improve the Efficiency of Zona-Free Mouse Nuclear Transfer" @default.
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- W2044910961 doi "https://doi.org/10.1089/clo.2006.8.10" @default.
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