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Synchronous division of mouse two-cell embryos with nocodazole in vitro

Summary. Mouse two-cell embryos were cultured in a medium supplemented with nocodazole or colcemid for 12·5–14·5 h in vitro, and development after elimination of these drugs was examined. All embryos cultured with nocodazole stopped at the metaphase of the second cell cycle. When nocodazole was removed, almost all embryos divided to the normal four-cell stage within 1 h and then developed into blastocysts (98%). The proportion of embryos that developed into young after transfer to recipients was not significantly different from the control (35 versus 36%), but the developmental ability of the embryos treated with colcemid was reduced, especially after transfer to recipients.

Keywords: blastocysts; nocodazole; colcemid; mouse

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