Hi,

My VCF file is annotatated with g1k frequency when such a frequency is
available.

I want to select all variants with a frequency below a certain cutoff say
1%. Thus I want all lines where this condition is satisfied BUT I also need
all the lines where there is no frequency annotation.

Does anyone know how to do this? I have tried but it would seem like
bcftools does not provide a way of testing whether a tag is present in the
INFO field.

Tim

-- 
Tim Hughes PhD
Medical Genetics Department
Oslo University Hospital (UllevÄl)
Kirkeveien 166
0407 Oslo
Norway
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