Because different tissues of same plant species differ in component composition, RNA extraction methods have different nodi.

同种植物不同器官的组织由于组成分的差异，提取RNA的方法也存在不同的难点。

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Conclusion: the results suggest that it had significant difference between four RNA extraction methods, so we should choose the appropriate one for detection of flu viruses in clinical specimens.

对临床标本的检测，也获得相似结果。结论：各试剂之间提取核酸的效率存在差异，应该选择性价比较好的方法进行临床标本的实验室RNA提取。

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Two total RNA extraction methods were developed firstly.

建立了两种木本植物总rna的提取方法。

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One example: The gene that makes the Epogen protein is expressed in only a few scattered tissues and is hard to detect by conventional gene-finding methods, which discover genes not by looking at DNA but by examining the RNA messengers that ferry genetic code between the DNA itself and the cellular machinery that make proteins.

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