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Equal supported reads along with genotype of 0/1
I use HC to call variants, and there is a record like this:
chr15 90172419 rs143394914 GGGGTGGGGGCTGTGGGCTGGGT G 88.77 . BaseQRankSum=0.406;DB;DP=6;FS=0.000;MLEAC=1;MLEAF=0.500;MQ=61.78;MQ0=0;MQRankSum=-4.060e-01;QD=2.02;ReadPosRankSum=-4.060e-01;SOR=0.693 GT:AD:GQ:PL 0/1:3,3:99:117,0,117
There are equal reads for ref allele and alt allele, why the genotype is 0/1 instead of 1/1? Though I know GT is inferred from PL and GQ, I still can not understand why PL for 0/1 is much lower than that of 1/1?