##gff-version 3
##sequence-region chr1 1 1000
##sequence-region chr2 1 600
chr1	synthetic	region	1	1000	.	+	.	ID=chr1;Name=chr1;genome=chromosome
chr2	synthetic	region	1	600	.	+	.	ID=chr2;Name=chr2;genome=chromosome
chr1	synthetic	gene	101	310	.	+	.	ID=geneA;Name=geneA
chr1	synthetic	mRNA	101	310	.	+	.	ID=txA;Parent=geneA
chr1	synthetic	exon	101	150	.	+	.	ID=exonA1;Parent=txA
chr1	synthetic	exon	251	310	.	+	.	ID=exonA2;Parent=txA
chr1	synthetic	CDS	111	150	.	+	0	Parent=txA
chr1	synthetic	CDS	251	300	.	+	2	Parent=txA
chr2	synthetic	gene	101	310	.	-	.	ID=geneD;Name=geneD
chr2	synthetic	mRNA	101	310	.	-	.	ID=txD;Parent=geneD
chr2	synthetic	exon	101	150	.	-	.	ID=exonD1;Parent=txD
chr2	synthetic	exon	251	310	.	-	.	ID=exonD2;Parent=txD