除了低克隆率-只有1.7%的胚胎能存活到最后阶段-创造转基因狗还有一个挑战即如何控制外部基因在核d NA中的植入位置。
Besides the low efficiency of cloning - just 1.7 per cent of embryos came to term - another challenge to creating transgenic dogs is controlling where in the nuclear DNA a foreign gene lands.
布朗支持想要创造混合胚胎的科学家。这混合胚胎，由人的细胞核植入动物卵细胞，经过几天的发育而成。
Brown supports scientists who want to create hybrid embryos in which the nuclei of human cells are inserted into animal eggs and allowed to grow for a few days.
此计划的报告说，长毛象的细胞核将注入到大象去除细胞核的卵细胞中，从而形成含长毛象基因的胚胎。
Under the plan, the nuclei of mammoth cells will be inserted into an elephant's egg cell from which the nuclei have been removed, to create an embryo containing mammoth genes, the report said.
目的探讨卵细胞第一极体形态与原核期受精卵形态、卵裂期胚胎质量的关系。
Objective To investigate the relationship between the first polar body morphology of oocyte and the zygote morphology in pronucleus stage, embryo quality in cleavage stage.
首先根据胚胎发育速度及形态评级，再根据受精卵原核等级的联合评级选择移植胚胎。
Embryos for transfer were selected initially by embryo growth rate and morphology, secondarily by zygote grade.
供体细胞核移入去核的卵母细胞后，必定要经过表观遗传修饰的重编程过程，回到胚胎开始发育的全能状态。
The donor nucleus must experienced the epigenetic modification of the process reprogramming and went back to the initial state after the donor cell was injected into the oocytes.
抽取癌症病人正常细胞的细胞核，替换人类受精卵细胞核，进行胚胎移植，建立干细胞系。
Cancer patients from normal cell nucleus to replace the nucleus of human embryos, embryo transfer and the establishment of stem cell lines.
但是核重编程仍是核移植技术的瓶颈，制约了重构胚胎干细胞的研究。
However, nuclear reprogramming, which stands in the way of reconstructed embryo stem cell research, is still a bottleneck in the procedure of nuclear transfer.
但是核重编程仍是核移植技术的瓶颈，制约了重构胚胎干细胞的研究。
However, nuclear reprogramming, which stands in the way of reconstructed embryo stem cell research, is still a bottleneck in the procedure of nuclear transfer.
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