It’s just an iterator to ensure the ID attribute is unique for proper parent/child feature reconstruction. It’s required on the computation side and is meaningless biologically.
> On Apr 3, 2018, at 12:49 PM, Qihua Liang <[hidden email]> wrote:
> Dear Maker development team,
> I find in the gff file of exon annotation, it looks like:
> ctg631 maker exon 16239 16243 . - . ID=pInfestans_00016306-RA:exon:96;Parent=pInfestans_00016306-RA;
> I am wondering what does “96” mean in ID=pInfestans_00016306-RA:exon:96, it does not look like the exon numbering because not all transcripts have an exon starts from 0.
> Thank you
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