DNA Marker Index information for Chromosome: M Marker: M18Names and Aliases for this DNA Marker: M18.1, M18, rs3909, M18.Chromosome Position in hg38 Human Genome assembly1: 12498.Chromosome Position in hg19 assembly2: 12498 .Ancestral marker allele value: C.Derived, alternative, or mutated marker allele value: T.