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.
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。
Pig cloning provides an efficient method for producing transgenic pigs, further more, it is the only approach which has been used to produce gene-targeted pigs so far.
核移植克隆猪技术的出现为生产转基因猪提供了一种有效的方法，并且是目前生产基因打靶猪的惟一方法。
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