{{Rsnum
|rsid=13143866
|Gene=IL21
|Chromosome=4
|position=122619603
|Orientation=plus
|GMAF=0.1979
|Gene_s=IL21
|Assembly=GRCh38
|GenomeBuild=38.1
|dbSNPBuild=141
|geno1=(A;A)
|geno2=(A;G)
|geno3=(G;G)
}}{{ population diversity
| geno1=(A;A)
| geno2=(A;G)
| geno3=(G;G)
| CEU | 7.1 | 36.3 | 56.6
| HCB | 0.7 | 20.4 | 78.8
| JPT | 1.8 | 23.9 | 74.3
| YRI | 6.8 | 31.3 | 61.9
| ASW | 3.6 | 39.3 | 57.1
| CHB | 0.7 | 20.4 | 78.8
| CHD | 1.8 | 12.8 | 85.3
| GIH | 0.0 | 23.8 | 76.2
| LWK | 4.5 | 25.5 | 70.0
| MEX | 3.4 | 22.4 | 74.1
| MKK | 5.1 | 30.1 | 64.7
| TSI | 6.9 | 46.5 | 46.5
| HapMapRevision=28
}}{{PMID Auto
|PMID=24389496
|Title=Interleukin (IL)-21 promoter polymorphism increases the risk of thyroid cancer in Chinese population
}}

{{PMID Auto
|PMID=20722033
|Title=The susceptibility loci juvenile idiopathic arthritis shares with other autoimmune diseases extend to PTPN2, COG6, and ANGPT1.
|OA=1
}}

{{PMID Auto
|PMID=23288348
|Title=IL-21 gene polymorphism is associated with the prognosis of breast cancer in Chinese populations.
}}

{{on chip | Affy GenomeWide 6}}
{{on chip | FTDNA}}