DNA Marker Index information for Chromosome: Y Marker: M81Names and Aliases for this DNA Marker: M81, PF2554, rs2032640.Chromosome Position in hg38 Human Genome assembly1: 19730686.Chromosome Position in hg19 assembly2: 21892572 .Ancestral marker allele value: C.Derived, alternative, or mutated marker allele value: T.