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'dot' value of DP in vcf file
I am trying to interpret DP value which is equal to 'dot' as in the vcf record. It appears to call heterozygous call for the sample and there are AD values but . DP value. Would you advise what it means?
4 191003240 . G T 182.87 . AC=1;AF=0.250;AN=4;BaseQRankSum=-1.422e+00;DP=66;FS=0.000;GQ_MEAN=50.00;GQ_STDDEV=70.71;MLEAC=2;MLEAF=0.500;MQ=39.14;MQ0=0;MQRankSum=-5.730e-01;NCC=0;QD=20.32;ReadPosRankSum=-2.480e-01;SOR=1.609 GT:AD:DP:GQ:PL 0/1:3,6:.:99:209,0,100 0/0:45,0:45:0:0,0,1135