{"TPMT": "Lower concentrations of TGN metabolites, but note that TGN after thioguanine are 5-10X higher than TGN after mercaptopurine or azathioprine. Normal risk of thiopurine-related leukopenia, neutropenia, myelosuppression.", "NUDT15": "Normal risk of thiopurine-related leukopenia, neutropenia, myelosuppression"}