I am trying to link my gene annotation file (gff) to Cuffcompare. However the gff file does not show up as a possible choice and the program asks for gtf. I want to use a novel cyanobacteria genome which cannot be found on the net as gtf file yet. I created my own gff file of the annotations with Geneious. Can someone help me with this? How can I convert gff into gtf.