DNA Marker Index information for Chromosome: Y Marker: M521Names and Aliases for this DNA Marker: M521, rs377458712, rs796071879.Chromosome Position in hg38 Human Genome assembly1: 6954907.Chromosome Position in hg19 assembly2: 6822948 .Ancestral marker allele value: C.Derived, alternative, or mutated marker allele value: T.