The mature embryo sac is surrounded by en lothelium tapetum. It is composed or an egg apparatus, one central cell with secondary nucleus, and 1—6 antipodal cells.

成熟胚囊被珠被绒毡县包围，由卵器、具次生核的中央细胞以及数目为1至6个反足细胞组成。

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Then a reconstructed embryo was completed by the direct injection of the donor nucleus or cell without pulling out the injection pipette.

最后在不拔出注射针的情况下直接注射细胞核或完整细胞进而完成重构胚的构建。

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At ellipsoidal embryo stage, the chromatin and nucleoli disappear and some cytoplasm enters the nucleus.

在椭形胚期，宿存助细胞核内的染色质及核仁消失，有细胞质侵入核内。

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In this new study, detailed this week in the journal Nature Methods, Hufnagel and colleagues recorded the movements of every cell nucleus in the embryo not only during the later developmental stages, but also throughout the first three hours of the embryo's life, when nuclei divide very rapidly.

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Sir Ian and his team fused the genetic information from an adult sheep cell nucleus with an egg cell to form an embryo that developed into a genetically identical copy of the original adult.

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Reproductive cloning, which created Dolly the sheep in 1997, involves transferring the nucleus of an adult cell into an egg, giving the resulting embryo a full set of genes without the normal sperm-meets-egg fertilisation step.

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