DNA Marker Index information for Chromosome: Y Marker: A503Names and Aliases for this DNA Marker: A503, FGC17454, rs907451816.Chromosome Position in hg38 Human Genome assembly1: 16604025.Chromosome Position in hg19 assembly2: 18715905 .Ancestral marker allele value: T.Derived, alternative, or mutated marker allele value: C.