DNA Marker Index information for Chromosome: M Marker: B4a'Names and Aliases for this DNA Marker: B4a', B4-C16261T, B4-a.Chromosome Position in hg38 Human Genome assembly1: 16261.Chromosome Position in hg19 assembly2: 16261 .Ancestral marker allele value: C.Derived, alternative, or mutated marker allele value: T.