{{Rsnum
|rsid = 3912
|geno1 = (A;A)
|geno2 = (A;T)
|geno3 = (T;T)
|Gene=TXLNGY
|Orientation=plus
|Chromosome=Y
|position=19570453
|Assembly=GRCh38
|GenomeBuild=38.1
|dbSNPBuild=141
|Gene_s=TXLNGY
}}{{hgsnp
|alternate_names=M21
|tree=ISOGG
|tree_build=2010
|clade_haplogroup=I
|ancestral_haplogroup=I1
|derived_haplogroup=I1a
|ancestral_allele=rs3912(A;A)
|derived_allele=rs3912(T;T)
}}{{ haplogroup snp }}

{{ neighbor
| rsid = 3909
| distance = 823
}}

{{on chip | 23andMe v1}}
{{on chip | 23andMe v2}}
{{on chip | 23andMe v3}}
{{on chip | 23andMe v4}}