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How to validate GFF3?

What tools are available to validate a GFF3 format file? I tried the one recommended by the Sequence Ontology Project but it has been offline every time I try it. I also tried GenomeTools. It helps but it does not catch all of the errors.

gff

You may want to state what your purpose is (or the problem you are having) because different tools have slightly different definitions of what "valid" means.

2 answers

What about GFF tools?

http://www.raetschlab.org/suppl/gff-tools

gff3validator from genometools? http://www.genometools.org/cgi-bin/gff3validator.cgi online web version and commandline tool.

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