There are 2 vcf files from the DNA sequencing available in GDC: one for the tumor and the other one for the normal sample. I'm a little confused about the presence of the normal vcf file. Is this file containing the somatic SNVs in the normal sample? If so, why many SNV in the 'normal' file show an higher allelic frequency in the 'tumor'? And, most important, why there are no SNVs present in the normal file with an allelic frequency>0 in the normal but =0 in the tumor?
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