DNA Marker Index information for Chromosome: Y Marker: BY181331Names and Aliases for this DNA Marker: BY181331, B557, rs902618607.Chromosome Position in hg38 Human Genome assembly1: 8969602.Chromosome Position in hg19 assembly2: 8837643 .Ancestral marker allele value: C.Derived, alternative, or mutated marker allele value: T.