{{Rsnum
|rsid=2140148
|Gene=CD28
|Chromosome=2
|position=203707417
|Orientation=minus
|GMAF=0.124
|Assembly=GRCh38
|GenomeBuild=38.1
|dbSNPBuild=141
|geno1=(G;G)
|geno2=(G;T)
|geno3=(T;T)
|Gene_s=CD28
}}{{ population diversity
| geno1=(G;G)
| geno2=(G;T)
| geno3=(T;T)
| CEU | 4.4 | 23.0 | 72.6
| HCB | 0.7 | 19.0 | 80.3
| JPT | 0.0 | 11.5 | 88.5
| YRI | 0.0 | 1.4 | 98.6
| ASW | 0.0 | 10.5 | 89.5
| CHB | 0.7 | 19.0 | 80.3
| CHD | 2.8 | 12.8 | 84.4
| GIH | 0.0 | 10.9 | 89.1
| LWK | 0.0 | 3.6 | 96.4
| MEX | 3.4 | 27.6 | 69.0
| MKK | 0.0 | 13.5 | 86.5
| TSI | 5.9 | 33.3 | 60.8
| HapMapRevision=28
}}{{PMID Auto
|PMID=20113255
|Title=Association of the CD28/CTLA4/ICOS polymorphisms with susceptibility to rheumatoid arthritis
}}

{{PMID Auto
|PMID=22977635
|Title=Association study between polymorphisms of CD28, CTLA4 and ICOS and non-segmental vitiligo in a Korean population
|OA=1
}}

{{on chip | 23andMe v3}}
{{on chip | 23andMe v4}}
{{on chip | FTDNA2}}
{{on chip | HumanOmni1Quad}}
{{on chip | Illumina Human 1M}}