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an error about HC call mutation genetoype and mutation type

sunylsunyl beijingMember

Hi professor,
when I use HC call mutations ,the genotype and mutation as follows:
HC_Gene.refGene Chr Start End Ref Alt III17
HAVCR1 chr5 156479568 156479568 C CGTT,* 0/1

but when I chek the bam file of the reads approve the mutation,I see that almost all reads approve the second type,why HC believe it 0/1 , not 2/2?
see the attachment?


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