{{Rsnum
|rsid=3749977
|Gene=OR2J3
|Chromosome=6
|position=29112567
|Orientation=minus
|GMAF=0.3219
|Gene_s=OR2J3
|Assembly=GRCh38
|GenomeBuild=38.1
|dbSNPBuild=141
|Summary=ability to smell cut grass
|geno1=(C;C)
|geno2=(C;T)
|geno3=(T;T)
}}{{ population diversity
| geno1=(C;C)
| geno2=(C;T)
| geno3=(T;T)
| CEU | 54.9 | 36.3 | 8.8
| HCB | 50.4 | 42.3 | 7.3
| JPT | 69.0 | 26.5 | 4.4
| YRI | 12.2 | 53.7 | 34.0
| ASW | 15.8 | 50.9 | 33.3
| CHB | 50.4 | 42.3 | 7.3
| CHD | 55.0 | 41.3 | 3.7
| GIH | 28.7 | 47.5 | 23.8
| LWK | 9.1 | 44.5 | 46.4
| MEX | 43.1 | 51.7 | 5.2
| MKK | 7.1 | 44.2 | 48.7
| TSI | 57.8 | 36.3 | 5.9
| HapMapRevision=28
}}[[rs3749977]], also known as Arg226Gln, is a SNP in the olfactory receptor [[OR2J3]] gene. The rarer allele is apparently always found with the rarer allele of [[rs28757581]], according to {{PMID|22714804|OA=1
}}.

A study of 52 unrelated volunteers who were not anosmic tested their ability to detect cis-3-hexen-1-ol (C3HEX), a compound given off by "wounded" plants, most typically, cut grass. The rarer alleles of [[rs3749977]] and [[rs28757581]] were associated with a lowered ability to detect this smell.{{PMID|22714804|OA=1
}}

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