因为PCR只有在两个引子距离非常近的时候（即大约1 kb）增大DNA,所以这项技术在识别一个特定的基因重组序列时非常有用,识别方法是选择两个引子去互补那些只有在重组DNA中距离非常相近的那些序列.
呼..GRE句子真是伤人啊..
英语翻译Because PCR can amplify DNA only when the two primers ar
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