##gff-version 3
##sequence-region   chr 1 10000
chr	.	gene	100	900	.	+	.	ID=gene1
chr	.	exon	100	900	.	+	.	Parent=gene1
###
chr	.	gene	1000	9000	.	+	.	ID=gene2
chr	.	exon	1000	9000	.	+	.	Parent=gene2
###
