Using gff format in IGV 1 Do not… Using gff format in IGV.

Renigunta 1. Do not omit the first line, especially for GFF 3.
As IGV supports both of GFF ver 2 and GFF ver 3, the file needs to be distinguished.
Do not miss the first line

##gff-version 3

2. Make sure tab is used to separate fields.
Even for the first line, there must be a tab between gff-version and 3.
No space.

Here are the specifications.

GFF version 2

GFF version 3

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