DNA Marker Index information for Chromosome: Y Marker: B644Names and Aliases for this DNA Marker: B644, FT299955, rs755093640.Chromosome Position in hg38 Human Genome assembly1: 6789271.Chromosome Position in hg19 assembly2: 6657312 .Ancestral marker allele value: G.Derived, alternative, or mutated marker allele value: A.