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Sequencing maps of known EGFR deletion in exon 19 of plasma cfDNA. cfDNA was extracted by modified phenol-chloroform (MPC) method (A) and QIAamp MinElute Virus Spin kit (Qiagen kit) (B). In (A), the height of mutant peak is similar to that of wild-type peak, while the height of mutant peak in (B) is much lower than that of wild-type peak. EGFR, epidermal growth factor receptor.
