EC:2.1.1.67; MetaCyc:THIOPURINE-S-METHYLTRANSFERASE-RXN; Reactome:R-HSA-5603379 "TPMT does not transfer CH3 from AdoMet to 6MP"; Reactome:R-HSA-9748979 "TPMT transfers methyl group to 6TIMP, forming 6MeTIMP"; Reactome:R-HSA-9748983 "TPMT transfers methyl group to 6MP, forming 6MeMP"; reactome:R-HSA-158609 "TPMT transfers CH3 from AdoMet to 6MP"