方法：用琼脂糖凝胶电泳法观察DNA的梯状条带。
Method:The DNA gradent bands were detected by agarose gel electrophoresis.
细胞核DNA琼脂糖凝胶电泳显示凋亡细胞特有的梯状条带。
The characteristic DNA ladder was found by the agarose gel electrophoresis for the nucleus DNA of transfected cells.
对水稻淀粉胚乳中的DNA进行凝胶电泳分析，不呈现典型的DNA梯状条带。
The analysis of DNA of rice starchy endosperm did not show the presence of DNA laddering.
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