{{Rsnum
|rsid=1879877
|Gene=CD28
|Chromosome=2
|position=203705277
|Orientation=minus
|GMAF=0.3545
|Gene_s=CD28
|Assembly=GRCh38
|GenomeBuild=38.1
|dbSNPBuild=141
|geno1=(A;A)
|geno2=(A;C)
|geno3=(C;C)
}}{{ population diversity
| geno1=(A;A)
| geno2=(A;C)
| geno3=(C;C)
| CEU | 5.3 | 31.9 | 62.8
| HCB | 36.1 | 48.1 | 15.8
| JPT | 22.3 | 58.9 | 18.8
| YRI | 8.2 | 48.3 | 43.5
| ASW | 12.5 | 42.9 | 44.6
| CHB | 36.1 | 48.1 | 15.8
| CHD | 27.5 | 52.3 | 20.2
| GIH | 2.0 | 23.8 | 74.3
| LWK | 13.8 | 52.3 | 33.9
| MEX | 10.5 | 35.1 | 54.4
| MKK | 12.8 | 52.6 | 34.6
| TSI | 6.9 | 40.6 | 52.5
| HapMapRevision=28
}}{{PMID Auto
|PMID=22977635
|Title=Association study between polymorphisms of CD28, CTLA4 and ICOS and non-segmental vitiligo in a Korean population
|OA=1
}}

{{PMID Auto
|PMID=24103478
|Title=Contribution of PTPN22, CD28, CTLA-4 and ZAP-70 variants to the risk of type 1 diabetes in Tunisians
}}
{{on chip | 23andMe v3}}
{{on chip | 23andMe v4}}
{{on chip | FTDNA2}}
{{on chip | FTDNA}}
{{on chip | HumanOmni1Quad}}
{{on chip | Illumina Human 1M}}