DNA Marker Index information for Chromosome: Y Marker: M123Names and Aliases for this DNA Marker: M123, PF2023, rs371143248.Chromosome Position in hg38 Human Genome assembly1: 19602700.Chromosome Position in hg19 assembly2: 21764586 .Ancestral marker allele value: C.Derived, alternative, or mutated marker allele value: T.