Rs1467558

After taking Acetaminophen (Tylenol&#174;), rs1467558(A;G) individuals have higher alanine aminotransferase (ALT) levels, a sign of liver toxicity, than do (G;G) homozygotes. More studies are needed; there was only 1 (A;A) individual, and he didn't show elevated ALT levels; furthermore, the ALT increases were "modest" anyway for (A;G) individuals compared to (G;G). see also: 23andMe blog

Note: the orientation of this SNP in SNPedia is as detailed in dbSNP, but in publications (including 23andMe's blog) the orientation is 'flipped', so what's (A;A) in dbSNP is (T;T) as discussed by the 23andMe blog.