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Representative bioanalyzer images of freshly isolated cfDNA from women with cancer (a–c) with contaminating high molecular weight DNA (marked with a black arrow and dotted line), the fraction of DNA from the same patients removed after the 0.5× SPRI AMPure bead purification step (d–f), and the resulting purified LMW cfDNA recovered after the 1.6× dilution SPRI AMPure bead purification (g–i). The desired cfDNA peak is marked with a green arrow and dotted line
