DNA Marker Index information for Chromosome: M Marker: A663GNames and Aliases for this DNA Marker: A663G, A663, rs3937039, rs56489998.Chromosome Position in hg38 Human Genome assembly1: 663.Chromosome Position in hg19 assembly2: 663 .Ancestral marker allele value: A.Derived, alternative, or mutated marker allele value: G.