DNA Marker Index information for Chromosome: M Marker: B4Names and Aliases for this DNA Marker: B4, B4, M12133, rs576744624.Chromosome Position in hg38 Human Genome assembly1: 16217.Chromosome Position in hg19 assembly2: 16217 .Ancestral marker allele value: T.Derived, alternative, or mutated marker allele value: C.