DNA Marker Index information for Chromosome: Y Marker: BY266Names and Aliases for this DNA Marker: BY266, Y3657, FGC8674, rs755882976.Chromosome Position in hg38 Human Genome assembly1: 21723891.Chromosome Position in hg19 assembly2: 23885777 .Ancestral marker allele value: G.Derived, alternative, or mutated marker allele value: C.