Scientists use exonuclease to study DNA repair mechanisms.

科学家使用外切酶来研究DNA（deoxyribonucleic acid，脱氧核糖核酸）修复机制。

Researchers observed the exonuclease action under a microscope.

研究人员在显微镜下观察了外切酶的作用。

Mutations in the exonuclease gene can lead to genetic disorders.

外切酶基因的突变可能导致遗传疾病。

The exonuclease removes nucleotides from the end of a DNA strand.

外切酶从DNA（deoxyribonucleic acid，脱氧核糖核酸）链的末端移除核苷酸。

The activity of the exonuclease is crucial for maintaining genome stability.

外切酶的活性对于维持基因组稳定性至关重要。