DNA Marker Index information for Chromosome: M Marker: B4b1a1'Names and Aliases for this DNA Marker: B4b1a1', B4b1a-G207A, B4b1a-a.Chromosome Position in hg38 Human Genome assembly1: 207.Chromosome Position in hg19 assembly2: 207 .Ancestral marker allele value: G.Derived, alternative, or mutated marker allele value: A.