Online resources
Online resources about GFF and GTF:- Definition of GTF format: http://mblab.wustl.edu/GTF22.html
- Definition of GFF3 format: http://www.sequenceontology.org/gff3.shtml
- Annotation resources at Ensembl http://www.ensembl.org/info/data/ftp/index.html
- Annotation resources at UCSC: http://genome.ucsc.edu/cgi-bin/hgTables
- Links to annotation resources for various model organisms: http://wiki.geneontology.org/index.php/Reference_Genome_sequence_annotation