Method:The DNA gradent bands were detected by agarose gel electrophoresis.

方法：用琼脂糖凝胶电泳法观察DNA的梯状条带。

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Method:The DNA gradent bands were detected by agarose gel electrophoresis.

方法：用琼脂糖凝胶电泳法观察DNA的梯状条带。

youdao