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Count of reads F1R2 and F2R1 annotations


From the Mutect2 output VCF, how does one interpret the values for the annotations of F1R2 and F2R1?

In the example below for a given position in a VCF:
chr5 32902979 A C GT:AD:AF:ALT_F1R2:ALT_F2R1:FOXOG:QSS:REF_F1R2:REF_F2R1 0/1:141,56:0.286:19:37:0.661:2825,403:56:85

the values are
ALT_F1R2: 19
ALT_F2R1: 37
REF_F1R2: 56
REF_F2R1: 85

Thanks for your input!


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