I have something like a VCF file as below :
chr position A1 A2 16 85955663 G A 16 85955671 A G 16 85955948 A G
The first column is the chromosome number, the second column is the position, the third column is A1 and the fourth column is A2.
I am unable to figure out if A1 is the reference allele or if A2 is the reference allele.
Is there a way I can find this out ? These are human SNPs.