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From SNPedia
Magnitude 2
Repute Bad
Summary NAT2 slow metabolizer
Criteria Gs140/criteria

Most non-Scandinavian Caucasians and approximately half of African-Americans are slow metabolizers.

This variation is important because of its primary role in the deactivation of many chemicals in the body's environment, including those produced by caffeine and cigarettes as well as aromatic amine and hydrazine drugs used medicinally. In general, slow metabolizers have higher rates of certain types of cancer and are more susceptible to side effects from chemicals metabolized by NAT2.[PMID 10667461]

According to this source 6 snps determine NAT2 metabolism. The way their genotypes interact is very complex, which makes this one of the largest genosets in SNPedia. The SNPs are: