Please give the online GFF3 validator a try: http://dev.wormbase.org/db/validate_gff3/validate_gff3_online Lincoln -- Lincoln D. Stein Cold Spring Harbor Laboratory 1 Bungtown Road Cold Spring Harbor, NY 11724 (516) 367-8380 (voice) (516) 367-8389 (fax) FOR URGENT MESSAGES & SCHEDULING, PLEASE CONTACT MY ASSISTANT, SANDRA MICHELSEN, AT michelse at cshl.edu