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最近，很多DNA片段的分离是利用表象差异分析法（rePresentationaldifferenceanalysis，RDA）。所谓RDA就是利用正常染色体DNA和相对的肿瘤染色体DNA之间的差异，分离DNA片段的一种方法。由此得到的来源于正常染色体的DNA片段，在肿瘤细胞系中是纯会缺失。用RDA法得到的DNA片段
Recently, many DNA fragments have been separated using representational analysis (RDA). The so-called RDA is a method of separating DNA fragments using the difference between normal chromosomal DNA and the relative tumor chromosomal DNA. The resulting DNA fragments derived from normal chromosomes are purely deleted in tumor cell lines. DNA fragments obtained by RDA