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VCF generation for somatic SNVs without "Normal Sample"

Hi there,

I am trying to follow the GATK tutorial for somatic mutations for GATK4, but my data does not quite match what the example is doing. Article name: (How to) Call somatic mutations using GATK4 Mutect2

I currently have a set of 6 WGS human DNA that I want to call and compare variants between them. Unfortunately I do not have a control/normal sample to set up the first step outlined by the tutorial. Should I be using a different tool to generate the VCF files then? Any recommendations on what pipeline to follow if I can't use the current one?

Thanks!
Max

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