Bacteria have defences against viruses in the form of chemicals called restriction enzymes, which chop up foreign DNA.
细菌有一种对病毒的防御机制：一种叫做限制性内切酶的化学物质可以切断外源dna。
The method USES fluorescence microscopy to image individual DNA molecules that have been divided into orderly fragments by so-called restriction enzymes.
该方法应用荧光显微术使单个DNA分子成像，这些单个的DNA分子已经被分成有序的片断，因而被称为限制性内切酶的识别序列。
Large DNA molecules are first dissected with restriction enzymes to produce specific fragments.
首先用限制性内切酶将大的DNA分子切断，产生出特殊的片段。
The Red mediated recombination can be used to insert, delete or substitute DNA sequences at any desired position on a target molecule without the need for restriction enzymes or DNA ligases.
这种技术可在DNA靶标分子的任意位点进行基因敲除、敲入、点突变等操作，无需使用限制性内切酶和连接酶。
Zinc finger nucleases (ZFNs) are artificial restriction enzymes made by fusing an engineered zinc finger DNA-binding domain to the DNA cleavage domain of a restriction enzyme.
锌指核酸酶是一种人工制做限制性内切酶，通过将锌指DNA结合区与限制性内切酶的DNA切割区融合获得。
Zinc finger nucleases (ZFNs) are artificial restriction enzymes made by fusing an engineered zinc finger DNA-binding domain to the DNA cleavage domain of a restriction enzyme.
锌指核酸酶是一种人工制做限制性内切酶，通过将锌指DNA结合区与限制性内切酶的DNA切割区融合获得。
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