{{Genotype
|rsid=1800462
|allele1=C
|allele2=G
|magnitude=2.5
|repute=Bad
|summary=detoxifying ability may be diminished
}}
a carrier for [[rs1800462(G;G)]] which may may be diminish you detoxifying ability for Thiopurine medications.

http://blog.23andme.com/health-traits/do-you-know-how-youll-respond-to-thiopurine-medications/