DNA Marker Index information for Chromosome: M Marker: A257GNames and Aliases for this DNA Marker: A257G, A257, i3000708, rs879026340.Chromosome Position in hg38 Human Genome assembly1: 257.Chromosome Position in hg19 assembly2: 257 .Ancestral marker allele value: A.Derived, alternative, or mutated marker allele value: G.