DNA Marker Index information for Chromosome: M Marker: C3921TNames and Aliases for this DNA Marker: C3921T, C3921, i4001019, rs878999809.Chromosome Position in hg38 Human Genome assembly1: 3921.Chromosome Position in hg19 assembly2: 3921 .Ancestral marker allele value: C.Derived, alternative, or mutated marker allele value: T.