1. Any of several enzymes, such as endonucleases and exonucleases, that hydrolize nucleic acids. 
   核酸酶水解核酸的酶，如核酸内切酶和核酸外切酶
2. Secondly, special enzymes called extinction enzymes are used to cut the DNA at specific places. 
   第二，利用被叫做限制性内切酶的特殊的酶在特定地方切断dna。
3. Any of a group of enzymes that catalyze the hydrolysis of bonds between nucleic acids in the interior of a DNA or an RNA sequence. 
   核酸内切酶在dna或rna系列内部催化核酸键解的任何酶群
4. self-opening die head and self-collapsing tap 
   自动开合螺纹切头
5. Any of a group of enzymes that catalyze the hydrolysis of single nucleotides from the end of a DNA or RNA chain. 
   核酸外切酶从脱氧核糖核酸链或核糖核酸链的末端催化单核苷酸水解的一种酶

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