{{Rsnum
|rsid=28757581
|Gene=OR2J3
|Chromosome=6
|position=29112227
|Orientation=plus
|GMAF=0.186
|Gene_s=OR2J3
|Assembly=GRCh38
|GenomeBuild=38.1
|dbSNPBuild=141
|Summary=ability to smell cut grass
|geno1=(A;A)
|geno2=(A;G)
|geno3=(G;G)
}}[[rs28757581]], also known as Thr113Ala, is a SNP in the olfactory receptor [[OR2J3]] gene. The rarer allele is apparently always found with the rarer allele of [[rs3749977]], 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
}}