##fileformat=VCFv4.2
##contig=<ID=1,assembly=b37,length=249250621>
##reference=file:ref.fa
##FORMAT=<ID=GT,Number=1,Type=String,Description="Genotype">
##FORMAT=<ID=AD,Number=A,Type=Integer,Description="Alleles">
#CHROM	POS	ID	REF	ALT	QUAL	FILTER	INFO	FORMAT	A	B
1	1890	.	A	G	.	.	.	GT:AD	./.:10,0	./.:0,10
