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The definition of "DP" in the vcf file

Dear Sir,

About DP in the vcf file, it describes as follows,
INFO=<ID=DP,Number=1,Type=Integer,Description="Approximate read depth; some reads may have been filtered">

What the criteria for filtering reads ? I observed the DP of many variants is lower than the DP in the bam file.

Thank you for kind help.

Best Regards,
Wei-Chi Wang

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